20120557120566 has 32 divisors (see below), whose sum is σ = 46769333748480. Its totient is φ = 5651294493216.

The previous prime is 20120557120481. The next prime is 20120557120637. The reversal of 20120557120566 is 66502175502102.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 4059835521 + ... + 4059840476.

It is an arithmetic number, because the mean of its divisors is an integer number (1461541679640).

Almost surely, 2^{20120557120566} is an apocalyptic number.

20120557120566 is an abundant number, since it is smaller than the sum of its proper divisors (26648776627914).

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

20120557120566 is a wasteful number, since it uses less digits than its factorization.

20120557120566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8119676068.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 20120557120566 in words is "twenty trillion, one hundred twenty billion, five hundred fifty-seven million, one hundred twenty thousand, five hundred sixty-six".