20315132 has 6 divisors (see below), whose sum is σ = 35551488. Its totient is φ = 10157564.

The previous prime is 20315129. The next prime is 20315143. The reversal of 20315132 is 23151302.

It is a self number, because there is not a number n which added to its sum of digits gives 20315132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2539388 + ... + 2539395.

It is an arithmetic number, because the mean of its divisors is an integer number (5925248).

Almost surely, 2^20315132 is an apocalyptic number.

It is an amenable number.

20315132 is a deficient number, since it is larger than the sum of its proper divisors (15236356).

20315132 is a wasteful number, since it uses less digits than its factorization.

20315132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078787 (or 5078785 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20315132 is about 4507.2310790551. The cubic root of 20315132 is about 272.8600050607.

Adding to 20315132 its reverse (23151302), we get a palindrome (43466434).

The spelling of 20315132 in words is "twenty million, three hundred fifteen thousand, one hundred thirty-two".