20293020 has 144 divisors (see below), whose sum is σ = 69215328. Its totient is φ = 4769280.

The previous prime is 20292997. The next prime is 20293067. The reversal of 20293020 is 2039202.

20293020 = 100² + 101² + ... + 395².

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20292984 and 20293002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73122 + ... + 73398.

It is an arithmetic number, because the mean of its divisors is an integer number (480662).

Almost surely, 2^20293020 is an apocalyptic number.

20293020 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 20293020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34607664).

20293020 is an abundant number, since it is smaller than the sum of its proper divisors (48922308).

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

20293020 is a wasteful number, since it uses less digits than its factorization.

20293020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20293020 is about 4504.7774639820. Note that the first 3 decimals coincide. The cubic root of 20293020 is about 272.7609709876.

The spelling of 20293020 in words is "twenty million, two hundred ninety-three thousand, twenty".