20432131 has 4 divisors (see below), whose sum is σ = 21091264. Its totient is φ = 19773000.

The previous prime is 20432123. The next prime is 20432143. The reversal of 20432131 is 13123402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20432131 - 2³ = 20432123 is a prime.

It is a super-2 number, since 2×20432131² = 834943954402322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20432101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329520 + ... + 329581.

It is an arithmetic number, because the mean of its divisors is an integer number (5272816).

Almost surely, 2^20432131 is an apocalyptic number.

20432131 is a deficient number, since it is larger than the sum of its proper divisors (659133).

20432131 is an equidigital number, since it uses as much as digits as its factorization.

20432131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659132.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20432131 is about 4520.1914782451. The cubic root of 20432131 is about 273.3828215305.

Adding to 20432131 its reverse (13123402), we get a palindrome (33555533).

The spelling of 20432131 in words is "twenty million, four hundred thirty-two thousand, one hundred thirty-one".