20634436612 has 24 divisors (see below), whose sum is σ = 37093396760. Its totient is φ = 10036431360.

The previous prime is 20634436609. The next prime is 20634436643. The reversal of 20634436612 is 21663443602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7481558016 + 13152878596 = 86496^2 + 114686^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

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 7 ways as a sum of consecutive naturals, for example, 1020214 + ... + 1040242.

Almost surely, 2^20634436612 is an apocalyptic number.

It is an amenable number.

20634436612 is a deficient number, since it is larger than the sum of its proper divisors (16458960148).

20634436612 is a wasteful number, since it uses less digits than its factorization.

20634436612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27031 (or 27029 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 20634436612 in words is "twenty billion, six hundred thirty-four million, four hundred thirty-six thousand, six hundred twelve".