20858731408 has 20 divisors (see below), whose sum is σ = 40430451100. Its totient is φ = 10425066624.

The previous prime is 20858731391. The next prime is 20858731409. The reversal of 20858731408 is 80413785802.

It can be written as a sum of positive squares in 2 ways, for example, as 8962030224 + 11896701184 = 94668^2 + 109072^2 .

It is not an unprimeable number, because it can be changed into a prime (20858731409) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 228483 + ... + 306466.

It is an arithmetic number, because the mean of its divisors is an integer number (2021522555).

Almost surely, 2^20858731408 is an apocalyptic number.

It is an amenable number.

20858731408 is a deficient number, since it is larger than the sum of its proper divisors (19571719692).

20858731408 is a wasteful number, since it uses less digits than its factorization.

20858731408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537394 (or 537388 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 20858731408 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-one thousand, four hundred eight".