20648516 has 48 divisors (see below), whose sum is σ = 44688000. Its totient is φ = 8149248.

The previous prime is 20648501. The next prime is 20648527. The reversal of 20648516 is 61584602.

It is a super-2 number, since 2×20648516² = 852722426004512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19160 + ... + 20208.

It is an arithmetic number, because the mean of its divisors is an integer number (931000).

Almost surely, 2^20648516 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 20648516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22344000).

20648516 is an abundant number, since it is smaller than the sum of its proper divisors (24039484).

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

20648516 is a wasteful number, since it uses less digits than its factorization.

20648516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1114 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20648516 is about 4544.0638199744. The cubic root of 20648516 is about 274.3445148717.

The spelling of 20648516 in words is "twenty million, six hundred forty-eight thousand, five hundred sixteen".