20369691 has 32 divisors (see below), whose sum is σ = 32352000. Its totient is φ = 12628224.

The previous prime is 20369681. The next prime is 20369711. The reversal of 20369691 is 19696302.

It is not a de Polignac number, because 20369691 - 2⁶ = 20369627 is a prime.

It is a super-2 number, since 2×20369691² = 829848622870962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20369681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29931 + ... + 30603.

It is an arithmetic number, because the mean of its divisors is an integer number (1011000).

Almost surely, 2^20369691 is an apocalyptic number.

20369691 is a deficient number, since it is larger than the sum of its proper divisors (11982309).

20369691 is a wasteful number, since it uses less digits than its factorization.

20369691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 754 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20369691 is about 4513.2794063740. The cubic root of 20369691 is about 273.1040540432.

The spelling of 20369691 in words is "twenty million, three hundred sixty-nine thousand, six hundred ninety-one".