20591316 has 36 divisors (see below), whose sum is σ = 53732224. Its totient is φ = 6642000.

The previous prime is 20591303. The next prime is 20591317. The reversal of 20591316 is 61319502.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20591316² = 848004589223712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20591316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20591317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8110 + ... + 10341.

Almost surely, 2^20591316 is an apocalyptic number.

It is an amenable number.

20591316 is an abundant number, since it is smaller than the sum of its proper divisors (33140908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20591316 is a wasteful number, since it uses less digits than its factorization.

20591316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18492 (or 18487 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20591316 is about 4537.7655294208. The cubic root of 20591316 is about 274.0909531642.

It can be divided in two parts, 2059 and 1316, that added together give a cube (3375 = 15³).

The spelling of 20591316 in words is "twenty million, five hundred ninety-one thousand, three hundred sixteen".