20201983640 has 32 divisors (see below), whose sum is σ = 45904516560. Its totient is φ = 8000784000.

The previous prime is 20201983561. The next prime is 20201983661. The reversal of 20201983640 is 4638910202.

It is a self number, because there is not a number n which added to its sum of digits gives 20201983640.

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, 2496206 + ... + 2504285.

Almost surely, 2^20201983640 is an apocalyptic number.

20201983640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201983640 is an abundant number, since it is smaller than the sum of its proper divisors (25702532920).

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

20201983640 is a wasteful number, since it uses less digits than its factorization.

20201983640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000603 (or 5000599 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 20201983640 in words is "twenty billion, two hundred one million, nine hundred eighty-three thousand, six hundred forty".