20456203665 has 32 divisors (see below), whose sum is σ = 33246581760. Its totient is φ = 10738861056.

The previous prime is 20456203613. The next prime is 20456203667. The reversal of 20456203665 is 56630265402.

It is not a de Polignac number, because 20456203665 - 2²³ = 20447815057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20456203667) 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, 263349 + ... + 332061.

It is an arithmetic number, because the mean of its divisors is an integer number (1038955680).

Almost surely, 2^20456203665 is an apocalyptic number.

It is an amenable number.

20456203665 is a deficient number, since it is larger than the sum of its proper divisors (12790378095).

20456203665 is a wasteful number, since it uses less digits than its factorization.

20456203665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69033.

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 20456203665 in words is "twenty billion, four hundred fifty-six million, two hundred three thousand, six hundred sixty-five".