20545433657 has 8 divisors (see below), whose sum is σ = 24861701376. Its totient is φ = 16574467392.

The previous prime is 20545433639. The next prime is 20545433659. The reversal of 20545433657 is 75633454502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20545433657 - 2²⁸ = 20276998201 is a prime.

It is a super-2 number, since 2×20545433657² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545433659) 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, 86325233 + ... + 86325470.

It is an arithmetic number, because the mean of its divisors is an integer number (3107712672).

Almost surely, 2^20545433657 is an apocalyptic number.

It is an amenable number.

20545433657 is a deficient number, since it is larger than the sum of its proper divisors (4316267719).

20545433657 is a wasteful number, since it uses less digits than its factorization.

20545433657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172650727.

The product of its (nonzero) digits is 1512000, while the sum is 44.

The spelling of 20545433657 in words is "twenty billion, five hundred forty-five million, four hundred thirty-three thousand, six hundred fifty-seven".