20557650220 has 24 divisors (see below), whose sum is σ = 43173775008. Its totient is φ = 8222544000.

The previous prime is 20557650209. The next prime is 20557650251. The reversal of 20557650220 is 2205675502.

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, 556320 + ... + 592120.

It is an arithmetic number, because the mean of its divisors is an integer number (1798907292).

Almost surely, 2^20557650220 is an apocalyptic number.

20557650220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20557650220 is an abundant number, since it is smaller than the sum of its proper divisors (22616124788).

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

20557650220 is a wasteful number, since it uses less digits than its factorization.

20557650220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64521 (or 64519 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 34.

The spelling of 20557650220 in words is "twenty billion, five hundred fifty-seven million, six hundred fifty thousand, two hundred twenty".