20556876420 has 72 divisors (see below), whose sum is σ = 62388144000. Its totient is φ = 5478995520.

The previous prime is 20556876413. The next prime is 20556876427. The reversal of 20556876420 is 2467865502.

20556876420 is a `hidden beast` number, since 2 + 0 + 5 + 568 + 7 + 64 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (20556876413) and next prime (20556876427).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20556876427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 331255 + ... + 388385.

It is an arithmetic number, because the mean of its divisors is an integer number (866502000).

Almost surely, 2^20556876420 is an apocalyptic number.

20556876420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20556876420 is an abundant number, since it is smaller than the sum of its proper divisors (41831267580).

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

20556876420 is a wasteful number, since it uses less digits than its factorization.

20556876420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59145 (or 59140 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 20556876420 in words is "twenty billion, five hundred fifty-six million, eight hundred seventy-six thousand, four hundred twenty".