20447565455 has 32 divisors (see below), whose sum is σ = 25791744384. Its totient is φ = 15532425216.

The previous prime is 20447565449. The next prime is 20447565461. The reversal of 20447565455 is 55456574402.

It is an interprime number because it is at equal distance from previous prime (20447565449) and next prime (20447565461).

It is a cyclic number.

It is not a de Polignac number, because 20447565455 - 2⁸ = 20447565199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16801007 + ... + 16802223.

It is an arithmetic number, because the mean of its divisors is an integer number (805992012).

Almost surely, 2^20447565455 is an apocalyptic number.

20447565455 is a deficient number, since it is larger than the sum of its proper divisors (5344178929).

20447565455 is a wasteful number, since it uses less digits than its factorization.

20447565455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195.

The product of its (nonzero) digits is 3360000, while the sum is 47.

The spelling of 20447565455 in words is "twenty billion, four hundred forty-seven million, five hundred sixty-five thousand, four hundred fifty-five".