20994165 has 12 divisors (see below), whose sum is σ = 36389964. Its totient is φ = 11196864.

The previous prime is 20994151. The next prime is 20994179. The reversal of 20994165 is 56149902.

It is an interprime number because it is at equal distance from previous prime (20994151) and next prime (20994179).

It can be written as a sum of positive squares in 2 ways, for example, as 2692881 + 18301284 = 1641^2 + 4278^2 .

It is not a de Polignac number, because 20994165 - 2¹⁵ = 20961397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233224 + ... + 233313.

It is an arithmetic number, because the mean of its divisors is an integer number (3032497).

Almost surely, 2^20994165 is an apocalyptic number.

It is an amenable number.

20994165 is a deficient number, since it is larger than the sum of its proper divisors (15395799).

20994165 is a wasteful number, since it uses less digits than its factorization.

20994165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466548 (or 466545 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20994165 is about 4581.9390000304. The cubic root of 20994165 is about 275.8668623781.

The spelling of 20994165 in words is "twenty million, nine hundred ninety-four thousand, one hundred sixty-five".