20223431644 has 18 divisors (see below), whose sum is σ = 38322805920. Its totient is φ = 9333891216.

The previous prime is 20223431633. The next prime is 20223431729. The reversal of 20223431644 is 44613432202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14957484 + ... + 14958835.

Almost surely, 2^20223431644 is an apocalyptic number.

It is an amenable number.

20223431644 is a deficient number, since it is larger than the sum of its proper divisors (18099374276).

20223431644 is a wasteful number, since it uses less digits than its factorization.

20223431644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29916349 (or 29916334 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 20223431644 its reverse (44613432202), we get a palindrome (64836863846).

The spelling of 20223431644 in words is "twenty billion, two hundred twenty-three million, four hundred thirty-one thousand, six hundred forty-four".