20505402544 has 40 divisors (see below), whose sum is σ = 43376130000. Its totient is φ = 9313075200.

The previous prime is 20505402539. The next prime is 20505402551. The reversal of 20505402544 is 44520450502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173184 + ... + 266464.

It is an arithmetic number, because the mean of its divisors is an integer number (1084403250).

Almost surely, 2^20505402544 is an apocalyptic number.

It is an amenable number.

20505402544 is an abundant number, since it is smaller than the sum of its proper divisors (22870727456).

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

20505402544 is a wasteful number, since it uses less digits than its factorization.

20505402544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94549 (or 94543 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 31.

The spelling of 20505402544 in words is "twenty billion, five hundred five million, four hundred two thousand, five hundred forty-four".