20551477100 has 108 divisors (see below), whose sum is σ = 56594112120. Its totient is φ = 6405638400.

The previous prime is 20551477073. The next prime is 20551477151. The reversal of 20551477100 is 177415502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 136745 + ... + 244544.

Almost surely, 2^20551477100 is an apocalyptic number.

20551477100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20551477100 is an abundant number, since it is smaller than the sum of its proper divisors (36042635020).

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

20551477100 is a wasteful number, since it uses less digits than its factorization.

20551477100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381328 (or 381314 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The spelling of 20551477100 in words is "twenty billion, five hundred fifty-one million, four hundred seventy-seven thousand, one hundred".