20155464 has 144 divisors (see below), whose sum is σ = 66023100. Its totient is φ = 5531904.

The previous prime is 20155441. The next prime is 20155481. The reversal of 20155464 is 46455102.

It can be written as a sum of positive squares in 2 ways, for example, as 17994564 + 2160900 = 4242^2 + 1470^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 102214 + ... + 102410.

Almost surely, 2^20155464 is an apocalyptic number.

20155464 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 20155464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33011550).

20155464 is an abundant number, since it is smaller than the sum of its proper divisors (45867636).

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

20155464 is a wasteful number, since it uses less digits than its factorization.

20155464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20155464 is about 4489.4837119651. The cubic root of 20155464 is about 272.1432708307.

The spelling of 20155464 in words is "twenty million, one hundred fifty-five thousand, four hundred sixty-four".