20235231307640 has 32 divisors (see below), whose sum is σ = 45546829206480. Its totient is φ = 8090970964992.

The previous prime is 20235231307639. The next prime is 20235231307679. The reversal of 20235231307640 is 4670313253202.

It is a junction number, because it is equal to n+sod(n) for n = 20235231307594 and 20235231307603.

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, 97443674 + ... + 97651113.

Almost surely, 2^{20235231307640} is an apocalyptic number.

20235231307640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20235231307640 is an abundant number, since it is smaller than the sum of its proper divisors (25311597898840).

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

20235231307640 is a wasteful number, since it uses less digits than its factorization.

20235231307640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195097391 (or 195097387 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 38.

The spelling of 20235231307640 in words is "twenty trillion, two hundred thirty-five billion, two hundred thirty-one million, three hundred seven thousand, six hundred forty".