20644600654 has 16 divisors (see below), whose sum is σ = 31318943040. Its totient is φ = 10205364960.

The previous prime is 20644600631. The next prime is 20644600657. The reversal of 20644600654 is 45600644602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644600657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214 + ... + 203209.

It is an arithmetic number, because the mean of its divisors is an integer number (1957433940).

Almost surely, 2^20644600654 is an apocalyptic number.

20644600654 is a deficient number, since it is larger than the sum of its proper divisors (10674342386).

20644600654 is a wasteful number, since it uses less digits than its factorization.

20644600654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205995.

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 20644600654 in words is "twenty billion, six hundred forty-four million, six hundred thousand, six hundred fifty-four".