15720132 has 24 divisors (see below), whose sum is σ = 38275776. Its totient is φ = 5012128.

The previous prime is 15720101. The next prime is 15720167. The reversal of 15720132 is 23102751.

It is a junction number, because it is equal to n+sod(n) for n = 15720099 and 15720108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28203 + ... + 28754.

It is an arithmetic number, because the mean of its divisors is an integer number (1594824).

Almost surely, 2^15720132 is an apocalyptic number.

15720132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15720132 is an abundant number, since it is smaller than the sum of its proper divisors (22555644).

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

15720132 is a wasteful number, since it uses less digits than its factorization.

15720132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56987 (or 56985 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 15720132 is about 3964.8621665828. The cubic root of 15720132 is about 250.5063444355.

Adding to 15720132 its reverse (23102751), we get a palindrome (38822883).

The spelling of 15720132 in words is "fifteen million, seven hundred twenty thousand, one hundred thirty-two".