20970816 has 56 divisors (see below), whose sum is σ = 55839360. Its totient is φ = 6945792.

The previous prime is 20970811. The next prime is 20970821. The reversal of 20970816 is 61807902.

It is an interprime number because it is at equal distance from previous prime (20970811) and next prime (20970821).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20970811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45660 + ... + 46116.

Almost surely, 2^20970816 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 20970816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27919680).

20970816 is an abundant number, since it is smaller than the sum of its proper divisors (34868544).

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

20970816 is a wasteful number, since it uses less digits than its factorization.

20970816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20970816 is about 4579.3903524378. The cubic root of 20970816 is about 275.7645545107.

The spelling of 20970816 in words is "twenty million, nine hundred seventy thousand, eight hundred sixteen".