20998736 has 20 divisors (see below), whose sum is σ = 44384064. Its totient is φ = 9544800.

The previous prime is 20998729. The next prime is 20998739. The reversal of 20998736 is 63789902.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998739) 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, 59480 + ... + 59831.

Almost surely, 2^20998736 is an apocalyptic number.

It is an amenable number.

20998736 is an abundant number, since it is smaller than the sum of its proper divisors (23385328).

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

20998736 is a wasteful number, since it uses less digits than its factorization.

20998736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119330 (or 119324 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20998736 is about 4582.4377791739. The cubic root of 20998736 is about 275.8868821617.

The spelling of 20998736 in words is "twenty million, nine hundred ninety-eight thousand, seven hundred thirty-six".