20983323631 has 4 divisors (see below), whose sum is σ = 21028841064. Its totient is φ = 20937806200.

The previous prime is 20983323527. The next prime is 20983323701. The reversal of 20983323631 is 13632338902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20983323631 - 2¹³ = 20983315439 is a prime.

It is a super-2 number, since 2×20983323631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20983303631) 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, 22758025 + ... + 22758946.

It is an arithmetic number, because the mean of its divisors is an integer number (5257210266).

Almost surely, 2^20983323631 is an apocalyptic number.

20983323631 is a deficient number, since it is larger than the sum of its proper divisors (45517433).

20983323631 is an equidigital number, since it uses as much as digits as its factorization.

20983323631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45517432.

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 20983323631 in words is "twenty billion, nine hundred eighty-three million, three hundred twenty-three thousand, six hundred thirty-one".