20645495 has 32 divisors (see below), whose sum is σ = 28593600. Its totient is φ = 14183424.

The previous prime is 20645483. The next prime is 20645539. The reversal of 20645495 is 59454602.

It is a happy number.

It is not a de Polignac number, because 20645495 - 2⁸ = 20645239 is a prime.

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, 90041 + ... + 90269.

It is an arithmetic number, because the mean of its divisors is an integer number (893550).

Almost surely, 2^20645495 is an apocalyptic number.

20645495 is a deficient number, since it is larger than the sum of its proper divisors (7948105).

20645495 is a wasteful number, since it uses less digits than its factorization.

20645495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 20645495 is about 4543.7313961105. The cubic root of 20645495 is about 274.3311348108.

The spelling of 20645495 in words is "twenty million, six hundred forty-five thousand, four hundred ninety-five".