20534177440 has 48 divisors (see below), whose sum is σ = 55442282112. Its totient is φ = 7040289024.

The previous prime is 20534177371. The next prime is 20534177479. The reversal of 20534177440 is 4477143502.

It is a self number, because there is not a number n which added to its sum of digits gives 20534177440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9165924 + ... + 9168163.

It is an arithmetic number, because the mean of its divisors is an integer number (1155047544).

Almost surely, 2^20534177440 is an apocalyptic number.

20534177440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20534177440 is an abundant number, since it is smaller than the sum of its proper divisors (34908104672).

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

20534177440 is a wasteful number, since it uses less digits than its factorization.

20534177440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18334109 (or 18334101 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 37.

The spelling of 20534177440 in words is "twenty billion, five hundred thirty-four million, one hundred seventy-seven thousand, four hundred forty".