20155056 has 40 divisors (see below), whose sum is σ = 52704960. Its totient is φ = 6636096.

The previous prime is 20155039. The next prime is 20155073. The reversal of 20155056 is 65055102.

It is an interprime number because it is at equal distance from previous prime (20155039) and next prime (20155073).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1455 + ... + 6513.

It is an arithmetic number, because the mean of its divisors is an integer number (1317624).

Almost surely, 2^20155056 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 20155056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26352480).

20155056 is an abundant number, since it is smaller than the sum of its proper divisors (32549904).

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

20155056 is a wasteful number, since it uses less digits than its factorization.

20155056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5153 (or 5147 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 20155056 is about 4489.4382722118. The cubic root of 20155056 is about 272.1414345180.

The spelling of 20155056 in words is "twenty million, one hundred fifty-five thousand, fifty-six".