20660988 has 12 divisors (see below), whose sum is σ = 48209000. Its totient is φ = 6886992.

The previous prime is 20660987. The next prime is 20660989. The reversal of 20660988 is 88906602.

It is an interprime number because it is at equal distance from previous prime (20660987) and next prime (20660989).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20660988² = 853752850272288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660987) 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, 860863 + ... + 860886.

Almost surely, 2^20660988 is an apocalyptic number.

It is an amenable number.

20660988 is an abundant number, since it is smaller than the sum of its proper divisors (27548012).

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

20660988 is a wasteful number, since it uses less digits than its factorization.

20660988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721756 (or 1721754 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 20660988 is about 4545.4359526892. The cubic root of 20660988 is about 274.3997397624.

The spelling of 20660988 in words is "twenty million, six hundred sixty thousand, nine hundred eighty-eight".