20412138644 has 12 divisors (see below), whose sum is σ = 35723417268. Its totient is φ = 10205448000.

The previous prime is 20412138611. The next prime is 20412138701. The reversal of 20412138644 is 44683121402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8528522500 + 11883616144 = 92350^2 + 109012^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77027 + ... + 216234.

It is an arithmetic number, because the mean of its divisors is an integer number (2976951439).

Almost surely, 2^20412138644 is an apocalyptic number.

It is an amenable number.

20412138644 is a deficient number, since it is larger than the sum of its proper divisors (15311278624).

20412138644 is a wasteful number, since it uses less digits than its factorization.

20412138644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310666 (or 310664 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 20412138644 in words is "twenty billion, four hundred twelve million, one hundred thirty-eight thousand, six hundred forty-four".