20430342644 has 12 divisors (see below), whose sum is σ = 35803532100. Its totient is φ = 10200762048.

The previous prime is 20430342643. The next prime is 20430342659. The reversal of 20430342644 is 44624303402.

It can be written as a sum of positive squares in 2 ways, for example, as 1631190544 + 18799152100 = 40388^2 + 137110^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20430342644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430342643) 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, 3599129 + ... + 3604800.

It is an arithmetic number, because the mean of its divisors is an integer number (2983627675).

Almost surely, 2^20430342644 is an apocalyptic number.

It is an amenable number.

20430342644 is a deficient number, since it is larger than the sum of its proper divisors (15373189456).

20430342644 is a wasteful number, since it uses less digits than its factorization.

20430342644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7204642 (or 7204640 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 32.

The spelling of 20430342644 in words is "twenty billion, four hundred thirty million, three hundred forty-two thousand, six hundred forty-four".