20982969 has 40 divisors (see below), whose sum is σ = 37403520. Its totient is φ = 11461824.

The previous prime is 20982961. The next prime is 20982977. The reversal of 20982969 is 96928902.

It is an interprime number because it is at equal distance from previous prime (20982961) and next prime (20982977).

It is not a de Polignac number, because 20982969 - 2³ = 20982961 is a prime.

It is a super-2 number, since 2×20982969² = 880569976109922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20982961) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12237 + ... + 13845.

It is an arithmetic number, because the mean of its divisors is an integer number (935088).

Almost surely, 2^20982969 is an apocalyptic number.

It is an amenable number.

20982969 is a deficient number, since it is larger than the sum of its proper divisors (16420551).

20982969 is a wasteful number, since it uses less digits than its factorization.

20982969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 20982969 is about 4580.7170836016. The cubic root of 20982969 is about 275.8178145499.

The spelling of 20982969 in words is "twenty million, nine hundred eighty-two thousand, nine hundred sixty-nine".