20992680 has 48 divisors (see below), whose sum is σ = 68227380. Its totient is φ = 5597952.

The previous prime is 20992669. The next prime is 20992681. The reversal of 20992680 is 8629902.

It can be written as a sum of positive squares in 2 ways, for example, as 20958084 + 34596 = 4578^2 + 186^2 .

It is a super-2 number, since 2×20992680² = 881385227164800, which contains 22 as substring.

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 (20992681) 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, 28797 + ... + 29516.

Almost surely, 2^20992680 is an apocalyptic number.

20992680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20992680 is an abundant number, since it is smaller than the sum of its proper divisors (47234700).

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

20992680 is a wasteful number, since it uses less digits than its factorization.

20992680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58330 (or 58323 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20992680 is about 4581.7769478664. The cubic root of 20992680 is about 275.8603578414.

The spelling of 20992680 in words is "twenty million, nine hundred ninety-two thousand, six hundred eighty".