20120020 has 24 divisors (see below), whose sum is σ = 42666624. Its totient is φ = 7969056.

The previous prime is 20119991. The next prime is 20120029. The reversal of 20120020 is 2002102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20119985 and 20120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2824 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (1777776).

Almost surely, 2^20120020 is an apocalyptic number.

20120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120020 is an abundant number, since it is smaller than the sum of its proper divisors (22546604).

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

20120020 is a wasteful number, since it uses less digits than its factorization.

20120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9879 (or 9877 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 20120020 is about 4485.5345277904. The cubic root of 20120020 is about 271.9836531410.

Adding to 20120020 its reverse (2002102), we get a palindrome (22122122).

The spelling of 20120020 in words is "twenty million, one hundred twenty thousand, twenty".