20158464 has 96 divisors (see below), whose sum is σ = 57198960. Its totient is φ = 6291456.

The previous prime is 20158433. The next prime is 20158477. The reversal of 20158464 is 46485102.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104352 + ... + 104544.

Almost surely, 2^20158464 is an apocalyptic number.

20158464 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 20158464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28599480).

20158464 is an abundant number, since it is smaller than the sum of its proper divisors (37040496).

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

20158464 is a wasteful number, since it uses less digits than its factorization.

20158464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20158464 is about 4489.8178136757. The cubic root of 20158464 is about 272.1567723690.

The spelling of 20158464 in words is "twenty million, one hundred fifty-eight thousand, four hundred sixty-four".