20844221631 has 16 divisors (see below), whose sum is σ = 28014201600. Its totient is φ = 13785352128.

The previous prime is 20844221621. The next prime is 20844221647. The reversal of 20844221631 is 13612244802.

It is not a de Polignac number, because 20844221631 - 2⁵ = 20844221599 is a prime.

It is a super-2 number, since 2×20844221631² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20844221592 and 20844221601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844221621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531075 + ... + 568971.

It is an arithmetic number, because the mean of its divisors is an integer number (1750887600).

Almost surely, 2^20844221631 is an apocalyptic number.

20844221631 is a deficient number, since it is larger than the sum of its proper divisors (7169979969).

20844221631 is a wasteful number, since it uses less digits than its factorization.

20844221631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39358.

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 20844221631 in words is "twenty billion, eight hundred forty-four million, two hundred twenty-one thousand, six hundred thirty-one".