20898736 has 20 divisors (see below), whose sum is σ = 40981752. Its totient is φ = 10322816.

The previous prime is 20898677. The next prime is 20898737. The reversal of 20898736 is 63789802.

It is a junction number, because it is equal to n+sod(n) for n = 20898692 and 20898701.

It is not an unprimeable number, because it can be changed into a prime (20898737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6541 + ... + 9196.

Almost surely, 2^20898736 is an apocalyptic number.

It is an amenable number.

20898736 is a deficient number, since it is larger than the sum of its proper divisors (20083016).

20898736 is a wasteful number, since it uses less digits than its factorization.

20898736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15828 (or 15822 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20898736 is about 4571.5135349247. The cubic root of 20898736 is about 275.4482430828.

The spelling of 20898736 in words is "twenty million, eight hundred ninety-eight thousand, seven hundred thirty-six".