20496961591 has 16 divisors (see below), whose sum is σ = 22514824800. Its totient is φ = 18573119488.

The previous prime is 20496961567. The next prime is 20496961609. The reversal of 20496961591 is 19516969402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20496961591 - 2²⁹ = 19960090679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20496961291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115140 + ... + 232918.

It is an arithmetic number, because the mean of its divisors is an integer number (1407176550).

Almost surely, 2^20496961591 is an apocalyptic number.

20496961591 is a deficient number, since it is larger than the sum of its proper divisors (2017863209).

20496961591 is a wasteful number, since it uses less digits than its factorization.

20496961591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118178.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The spelling of 20496961591 in words is "twenty billion, four hundred ninety-six million, nine hundred sixty-one thousand, five hundred ninety-one".