20899131 has 8 divisors (see below), whose sum is σ = 30398784. Its totient is φ = 12666120.

The previous prime is 20899129. The next prime is 20899159. The reversal of 20899131 is 13199802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20899131 - 2¹ = 20899129 is a prime.

It is a super-2 number, since 2×20899131² = 873547353110322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 633307 = 20899131 / (2 + 0 + 8 + 9 + 9 + 1 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 20899092 and 20899101.

It is not an unprimeable number, because it can be changed into a prime (20899121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316621 + ... + 316686.

It is an arithmetic number, because the mean of its divisors is an integer number (3799848).

Almost surely, 2^20899131 is an apocalyptic number.

20899131 is a deficient number, since it is larger than the sum of its proper divisors (9499653).

20899131 is a wasteful number, since it uses less digits than its factorization.

20899131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633321.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 20899131 is about 4571.5567370426. The cubic root of 20899131 is about 275.4499784568.

The spelling of 20899131 in words is "twenty million, eight hundred ninety-nine thousand, one hundred thirty-one".