20155824 has 160 divisors (see below), whose sum is σ = 64648640. Its totient is φ = 5971968.

The previous prime is 20155813. The next prime is 20155831. The reversal of 20155824 is 42855102.

It is a happy number.

It is a super-2 number, since 2×20155824² = 812514482237952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207744 + ... + 207840.

It is an arithmetic number, because the mean of its divisors is an integer number (404054).

Almost surely, 2^20155824 is an apocalyptic number.

20155824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20155824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32324320).

20155824 is an abundant number, since it is smaller than the sum of its proper divisors (44492816).

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

20155824 is a wasteful number, since it uses less digits than its factorization.

20155824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 20155824 is about 4489.5238054832. The cubic root of 20155824 is about 272.1448910860.

The spelling of 20155824 in words is "twenty million, one hundred fifty-five thousand, eight hundred twenty-four".