20557155480 has 64 divisors (see below), whose sum is σ = 65299206240. Its totient is φ = 5159442432.

The previous prime is 20557155461. The next prime is 20557155529. The reversal of 20557155480 is 8455175502.

It is a congruent number.

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, 5036479 + ... + 5040558.

Almost surely, 2^20557155480 is an apocalyptic number.

20557155480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20557155480 is an abundant number, since it is smaller than the sum of its proper divisors (44742050760).

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

20557155480 is a wasteful number, since it uses less digits than its factorization.

20557155480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10077068 (or 10077064 counting only the distinct ones).

The product of its (nonzero) digits is 280000, while the sum is 42.

The spelling of 20557155480 in words is "twenty billion, five hundred fifty-seven million, one hundred fifty-five thousand, four hundred eighty".