20998992 has 40 divisors (see below), whose sum is σ = 61998016. Its totient is φ = 5999616.

The previous prime is 20998969. The next prime is 20998993. The reversal of 20998992 is 29989902.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998993) 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, 30913 + ... + 31584.

Almost surely, 2^20998992 is an apocalyptic number.

It is an amenable number.

20998992 is an abundant number, since it is smaller than the sum of its proper divisors (40999024).

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

20998992 is a wasteful number, since it uses less digits than its factorization.

20998992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62515 (or 62509 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 20998992 is about 4582.4657118193. The cubic root of 20998992 is about 275.8880032888. Note that the first 3 decimals are identical.

The spelling of 20998992 in words is "twenty million, nine hundred ninety-eight thousand, nine hundred ninety-two".