20558742672 has 80 divisors (see below), whose sum is σ = 60205799360. Its totient is φ = 5992828416.

The previous prime is 20558742661. The next prime is 20558742689. The reversal of 20558742672 is 27624785502.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 855163 + ... + 878874.

It is an arithmetic number, because the mean of its divisors is an integer number (752572492).

Almost surely, 2^20558742672 is an apocalyptic number.

It is an amenable number.

20558742672 is an abundant number, since it is smaller than the sum of its proper divisors (39647056688).

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

20558742672 is a wasteful number, since it uses less digits than its factorization.

20558742672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734080 (or 1734074 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 48.

It can be divided in two parts, 20558 and 742672, that added together give a triangular number (763230 = T₁₂₃₅).

The spelling of 20558742672 in words is "twenty billion, five hundred fifty-eight million, seven hundred forty-two thousand, six hundred seventy-two".