20897930940 has 24 divisors (see below), whose sum is σ = 58514206800. Its totient is φ = 5572781568.

The previous prime is 20897930917. The next prime is 20897930951. The reversal of 20897930940 is 4903979802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174149365 + ... + 174149484.

It is an arithmetic number, because the mean of its divisors is an integer number (2438091950).

Almost surely, 2^20897930940 is an apocalyptic number.

20897930940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20897930940 is an abundant number, since it is smaller than the sum of its proper divisors (37616275860).

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

20897930940 is a wasteful number, since it uses less digits than its factorization.

20897930940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348298861 (or 348298859 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 20897930940 in words is "twenty billion, eight hundred ninety-seven million, nine hundred thirty thousand, nine hundred forty".