20970400 has 72 divisors (see below), whose sum is σ = 55871424. Its totient is φ = 7622400.

The previous prime is 20970373. The next prime is 20970407. The reversal of 20970400 is 407902.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20970407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7609 + ... + 9991.

It is an arithmetic number, because the mean of its divisors is an integer number (775992).

Almost surely, 2^20970400 is an apocalyptic number.

20970400 is a gapful number since it is divisible by the number (20) 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 20970400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27935712).

20970400 is an abundant number, since it is smaller than the sum of its proper divisors (34901024).

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

20970400 is a wasteful number, since it uses less digits than its factorization.

20970400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414 (or 2401 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20970400 is about 4579.3449313193. The cubic root of 20970400 is about 275.7627310431.

The spelling of 20970400 in words is "twenty million, nine hundred seventy thousand, four hundred".