20888465 has 16 divisors (see below), whose sum is σ = 27280848. Its totient is φ = 15261696.

The previous prime is 20888449. The next prime is 20888473. The reversal of 20888465 is 56488802.

It can be written as a sum of positive squares in 8 ways, for example, as 30976 + 20857489 = 176^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 20888465 - 2⁴ = 20888449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4649 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (1705053).

Almost surely, 2^20888465 is an apocalyptic number.

It is an amenable number.

20888465 is a deficient number, since it is larger than the sum of its proper divisors (6392383).

20888465 is a wasteful number, since it uses less digits than its factorization.

20888465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428.

The product of its (nonzero) digits is 122880, while the sum is 41.

The square root of 20888465 is about 4570.3900271202. The cubic root of 20888465 is about 275.4031112862.

The spelling of 20888465 in words is "twenty million, eight hundred eighty-eight thousand, four hundred sixty-five".