20634465 has 16 divisors (see below), whose sum is σ = 33270336. Its totient is φ = 10920000.

The previous prime is 20634461. The next prime is 20634469. The reversal of 20634465 is 56443602.

It is an interprime number because it is at equal distance from previous prime (20634461) and next prime (20634469).

It is not a de Polignac number, because 20634465 - 2² = 20634461 is a prime.

It is a super-2 number, since 2×20634465² = 851562291672450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20634461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3286 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (2079396).

Almost surely, 2^20634465 is an apocalyptic number.

It is an amenable number.

20634465 is a deficient number, since it is larger than the sum of its proper divisors (12635871).

20634465 is a wasteful number, since it uses less digits than its factorization.

20634465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10640.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 20634465 is about 4542.5174738244. The cubic root of 20634465 is about 274.2822716659.

The spelling of 20634465 in words is "twenty million, six hundred thirty-four thousand, four hundred sixty-five".