20015408 has 40 divisors (see below), whose sum is σ = 44619168. Its totient is φ = 8520192.

The previous prime is 20015393. The next prime is 20015419. The reversal of 20015408 is 80451002.

It is a self number, because there is not a number n which added to its sum of digits gives 20015408.

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, 18860 + ... + 19892.

Almost surely, 2^20015408 is an apocalyptic number.

20015408 is a gapful number since it is divisible by the number (28) 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 20015408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22309584).

20015408 is an abundant number, since it is smaller than the sum of its proper divisors (24603760).

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

20015408 is a wasteful number, since it uses less digits than its factorization.

20015408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221 (or 1215 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20015408 is about 4473.8582901116. The cubic root of 20015408 is about 271.5114500110.

The spelling of 20015408 in words is "twenty million, fifteen thousand, four hundred eight".