20983931 has 8 divisors (see below), whose sum is σ = 21986304. Its totient is φ = 20001960.

The previous prime is 20983927. The next prime is 20983951. The reversal of 20983931 is 13938902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20983931 - 2² = 20983927 is a prime.

It is a super-2 number, since 2×20983931² = 880650720425522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20983891 and 20983900.

It is not an unprimeable number, because it can be changed into a prime (20983951) 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, 2975 + ... + 7128.

It is an arithmetic number, because the mean of its divisors is an integer number (2748288).

Almost surely, 2^20983931 is an apocalyptic number.

20983931 is a deficient number, since it is larger than the sum of its proper divisors (1002373).

20983931 is a wasteful number, since it uses less digits than its factorization.

20983931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20983931 is about 4580.8220877917. The cubic root of 20983931 is about 275.8220295982.

The spelling of 20983931 in words is "twenty million, nine hundred eighty-three thousand, nine hundred thirty-one".