20027557931 has 4 divisors (see below), whose sum is σ = 21205649592. Its totient is φ = 18849466272.

The previous prime is 20027557909. The next prime is 20027557933. The reversal of 20027557931 is 13975572002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20027557931 is a prime.

It is a super-2 number, since 2×20027557931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20027557933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589045805 + ... + 589045838.

It is an arithmetic number, because the mean of its divisors is an integer number (5301412398).

Almost surely, 2^20027557931 is an apocalyptic number.

20027557931 is a deficient number, since it is larger than the sum of its proper divisors (1178091661).

20027557931 is a wasteful number, since it uses less digits than its factorization.

20027557931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178091660.

The product of its (nonzero) digits is 132300, while the sum is 41.

The spelling of 20027557931 in words is "twenty billion, twenty-seven million, five hundred fifty-seven thousand, nine hundred thirty-one".