20897604 has 72 divisors (see below), whose sum is σ = 65024960. Its totient is φ = 5510592.

The previous prime is 20897599. The next prime is 20897609. The reversal of 20897604 is 40679802.

It is an interprime number because it is at equal distance from previous prime (20897599) and next prime (20897609).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20897609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87 + ... + 6465.

Almost surely, 2^20897604 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 20897604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32512480).

20897604 is an abundant number, since it is smaller than the sum of its proper divisors (44127356).

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

20897604 is a wasteful number, since it uses less digits than its factorization.

20897604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409 (or 6404 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20897604 is about 4571.3897230492. The cubic root of 20897604 is about 275.4432696872.

The spelling of 20897604 in words is "twenty million, eight hundred ninety-seven thousand, six hundred four".