20340923840 has 28 divisors (see below), whose sum is σ = 48436825656. Its totient is φ = 8136369408.

The previous prime is 20340923833. The next prime is 20340923851. The reversal of 20340923840 is 4832904302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20340923840.

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, 31782374 + ... + 31783013.

Almost surely, 2^20340923840 is an apocalyptic number.

20340923840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340923840 is an abundant number, since it is smaller than the sum of its proper divisors (28095901816).

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

20340923840 is an equidigital number, since it uses as much as digits as its factorization.

20340923840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63565404 (or 63565394 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 20340923840 in words is "twenty billion, three hundred forty million, nine hundred twenty-three thousand, eight hundred forty".