20644540707 has 32 divisors (see below), whose sum is σ = 31711979520. Its totient is φ = 11702154240.

The previous prime is 20644540667. The next prime is 20644540717. The reversal of 20644540707 is 70704544602.

It is not a de Polignac number, because 20644540707 - 2⁶ = 20644540643 is a prime.

It is a super-2 number, since 2×20644540707² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20644540717) 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, 1318219 + ... + 1333787.

It is an arithmetic number, because the mean of its divisors is an integer number (990999360).

Almost surely, 2^20644540707 is an apocalyptic number.

20644540707 is a deficient number, since it is larger than the sum of its proper divisors (11067438813).

20644540707 is a wasteful number, since it uses less digits than its factorization.

20644540707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16083.

The product of its (nonzero) digits is 188160, while the sum is 39.

The spelling of 20644540707 in words is "twenty billion, six hundred forty-four million, five hundred forty thousand, seven hundred seven".