20634436613 has 32 divisors (see below), whose sum is σ = 25892213760. Its totient is φ = 16033812480.

The previous prime is 20634436609. The next prime is 20634436643. The reversal of 20634436613 is 31663443602.

It is not a de Polignac number, because 20634436613 - 2² = 20634436609 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634436643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1480445 + ... + 1494317.

It is an arithmetic number, because the mean of its divisors is an integer number (809131680).

Almost surely, 2^20634436613 is an apocalyptic number.

It is an amenable number.

20634436613 is a deficient number, since it is larger than the sum of its proper divisors (5257777147).

20634436613 is a wasteful number, since it uses less digits than its factorization.

20634436613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14357.

The product of its (nonzero) digits is 186624, while the sum is 38.

The spelling of 20634436613 in words is "twenty billion, six hundred thirty-four million, four hundred thirty-six thousand, six hundred thirteen".