20155072 has 42 divisors (see below), whose sum is σ = 46532292. Its totient is φ = 8636544.

The previous prime is 20155039. The next prime is 20155073. The reversal of 20155072 is 27055102.

It is not an unprimeable number, because it can be changed into a prime (20155073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78 + ... + 6349.

Almost surely, 2^20155072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20155072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23266146).

20155072 is an abundant number, since it is smaller than the sum of its proper divisors (26377220).

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

20155072 is an equidigital number, since it uses as much as digits as its factorization.

20155072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6453 (or 6436 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 20155072 is about 4489.4400541716. The cubic root of 20155072 is about 272.1415065307.

The spelling of 20155072 in words is "twenty million, one hundred fifty-five thousand, seventy-two".