20874797540 has 24 divisors (see below), whose sum is σ = 43866499320. Its totient is φ = 8344314368.

The previous prime is 20874797533. The next prime is 20874797551. The reversal of 20874797540 is 4579747802.

It can be written as a sum of positive squares in 4 ways, for example, as 7946652736 + 12928144804 = 89144^2 + 113702^2 .

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, 319685 + ... + 379404.

It is an arithmetic number, because the mean of its divisors is an integer number (1827770805).

Almost surely, 2^20874797540 is an apocalyptic number.

20874797540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20874797540 is an abundant number, since it is smaller than the sum of its proper divisors (22991701780).

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

20874797540 is a wasteful number, since it uses less digits than its factorization.

20874797540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700591 (or 700589 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 20874797540 in words is "twenty billion, eight hundred seventy-four million, seven hundred ninety-seven thousand, five hundred forty".