20610816 has 72 divisors (see below), whose sum is σ = 56120064. Its totient is φ = 6712320.

The previous prime is 20610791. The next prime is 20610827. The reversal of 20610816 is 61801602.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 35811 + ... + 36381.

Almost surely, 2^20610816 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 20610816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28060032).

20610816 is an abundant number, since it is smaller than the sum of its proper divisors (35509248).

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

20610816 is an equidigital number, since it uses as much as digits as its factorization.

20610816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20610816 is about 4539.9136555666. The cubic root of 20610816 is about 274.1774473495.

The spelling of 20610816 in words is "twenty million, six hundred ten thousand, eight hundred sixteen".