20151432 has 48 divisors (see below), whose sum is σ = 62375040. Its totient is φ = 5757408.

The previous prime is 20151407. The next prime is 20151449. The reversal of 20151432 is 23415102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19488 + ... + 20495.

It is an arithmetic number, because the mean of its divisors is an integer number (1299480).

Almost surely, 2^20151432 is an apocalyptic number.

It is an amenable number.

20151432 is an abundant number, since it is smaller than the sum of its proper divisors (42223608).

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

20151432 is a wasteful number, since it uses less digits than its factorization.

20151432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40002 (or 39995 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20151432 is about 4489.0346400980. The cubic root of 20151432 is about 272.1251226527.

Adding to 20151432 its reverse (23415102), we get a palindrome (43566534).

The spelling of 20151432 in words is "twenty million, one hundred fifty-one thousand, four hundred thirty-two".