20155312 has 20 divisors (see below), whose sum is σ = 39220456. Its totient is φ = 10033920.

The previous prime is 20155307. The next prime is 20155321. The reversal of 20155312 is 21355102.

It is a self number, because there is not a number n which added to its sum of digits gives 20155312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1243 + ... + 6469.

Almost surely, 2^20155312 is an apocalyptic number.

It is an amenable number.

20155312 is a deficient number, since it is larger than the sum of its proper divisors (19065144).

20155312 is a wasteful number, since it uses less digits than its factorization.

20155312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476 (or 5470 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20155312 is about 4489.4667834833. The cubic root of 20155312 is about 272.1425867171.

The spelling of 20155312 in words is "twenty million, one hundred fifty-five thousand, three hundred twelve".