20531761488 has 60 divisors (see below), whose sum is σ = 65669049888. Its totient is φ = 5866217280.

The previous prime is 20531761457. The next prime is 20531761489. The reversal of 20531761488 is 88416713502.

20531761488 is a `hidden beast` number, since 2 + 0 + 531 + 76 + 1 + 48 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531761489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10183398 + ... + 10185413.

Almost surely, 2^20531761488 is an apocalyptic number.

20531761488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20531761488 is an abundant number, since it is smaller than the sum of its proper divisors (45137288400).

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

20531761488 is a wasteful number, since it uses less digits than its factorization.

20531761488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20368832 (or 20368823 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 20531761488 in words is "twenty billion, five hundred thirty-one million, seven hundred sixty-one thousand, four hundred eighty-eight".