20132720 has 40 divisors (see below), whose sum is σ = 47005920. Its totient is φ = 8019200.

The previous prime is 20132713. The next prime is 20132803. The reversal of 20132720 is 2723102.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 28370 + ... + 29070.

It is an arithmetic number, because the mean of its divisors is an integer number (1175148).

Almost surely, 2^20132720 is an apocalyptic number.

20132720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20132720 is an abundant number, since it is smaller than the sum of its proper divisors (26873200).

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

20132720 is a wasteful number, since it uses less digits than its factorization.

20132720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20132720 is about 4486.9499662911. The cubic root of 20132720 is about 272.0408675618.

Adding to 20132720 its reverse (2723102), we get a palindrome (22855822).

The spelling of 20132720 in words is "twenty million, one hundred thirty-two thousand, seven hundred twenty".