20373378640 has 20 divisors (see below), whose sum is σ = 47368105524. Its totient is φ = 8149351424.

The previous prime is 20373378617. The next prime is 20373378661. The reversal of 20373378640 is 4687337302.

It can be written as a sum of positive squares in 2 ways, for example, as 14230581264 + 6142797376 = 119292^2 + 78376^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127333537 + ... + 127333696.

Almost surely, 2^20373378640 is an apocalyptic number.

20373378640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20373378640 is an abundant number, since it is smaller than the sum of its proper divisors (26994726884).

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

20373378640 is a wasteful number, since it uses less digits than its factorization.

20373378640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254667246 (or 254667240 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 43.

The spelling of 20373378640 in words is "twenty billion, three hundred seventy-three million, three hundred seventy-eight thousand, six hundred forty".