20372022640 has 40 divisors (see below), whose sum is σ = 47370905568. Its totient is φ = 8147784960.

The previous prime is 20372022637. The next prime is 20372022673. The reversal of 20372022640 is 4622027302.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 20372022599 and 20372022608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1176445 + ... + 1193635.

Almost surely, 2^20372022640 is an apocalyptic number.

20372022640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20372022640 is an abundant number, since it is smaller than the sum of its proper divisors (26998882928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20372022640 is a wasteful number, since it uses less digits than its factorization.

20372022640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32017 (or 32011 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

Adding to 20372022640 its reverse (4622027302), we get a palindrome (24994049942).

The spelling of 20372022640 in words is "twenty billion, three hundred seventy-two million, twenty-two thousand, six hundred forty".