20047920 has 80 divisors (see below), whose sum is σ = 62829312. Its totient is φ = 5287680.

The previous prime is 20047919. The next prime is 20047921. The reversal of 20047920 is 2974002.

It is an interprime number because it is at equal distance from previous prime (20047919) and next prime (20047921).

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20047921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24315 + ... + 25125.

Almost surely, 2^20047920 is an apocalyptic number.

20047920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20047920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31414656).

20047920 is an abundant number, since it is smaller than the sum of its proper divisors (42781392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20047920 is a wasteful number, since it uses less digits than its factorization.

20047920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20047920 is about 4477.4903684989. The cubic root of 20047920 is about 271.6583802324.

The spelling of 20047920 in words is "twenty million, forty-seven thousand, nine hundred twenty".