20428927656 has 64 divisors (see below), whose sum is σ = 51907392000. Its totient is φ = 6698586048.

The previous prime is 20428927627. The next prime is 20428927667. The reversal of 20428927656 is 65672982402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20428927599 and 20428927608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1186195 + ... + 1203293.

It is an arithmetic number, because the mean of its divisors is an integer number (811053000).

Almost surely, 2^20428927656 is an apocalyptic number.

It is an amenable number.

20428927656 is an abundant number, since it is smaller than the sum of its proper divisors (31478464344).

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

20428927656 is a wasteful number, since it uses less digits than its factorization.

20428927656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17918 (or 17914 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 20428927656 in words is "twenty billion, four hundred twenty-eight million, nine hundred twenty-seven thousand, six hundred fifty-six".