20331129 has 24 divisors (see below), whose sum is σ = 33962880. Its totient is φ = 10723104.

The previous prime is 20331127. The next prime is 20331139. The reversal of 20331129 is 92113302.

It is a happy number.

It is not a de Polignac number, because 20331129 - 2¹ = 20331127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20331127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3409 + ... + 7230.

It is an arithmetic number, because the mean of its divisors is an integer number (1415120).

Almost surely, 2^20331129 is an apocalyptic number.

It is an amenable number.

20331129 is a deficient number, since it is larger than the sum of its proper divisors (13631751).

20331129 is a wasteful number, since it uses less digits than its factorization.

20331129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10669 (or 10662 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20331129 is about 4509.0053226848. The cubic root of 20331129 is about 272.9316067989.

The spelling of 20331129 in words is "twenty million, three hundred thirty-one thousand, one hundred twenty-nine".