20305857400 has 48 divisors (see below), whose sum is σ = 49988251440. Its totient is φ = 7644556800.

The previous prime is 20305857379. The next prime is 20305857413. The reversal of 20305857400 is 475850302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2982756 + ... + 2989555.

It is an arithmetic number, because the mean of its divisors is an integer number (1041421905).

Almost surely, 2^20305857400 is an apocalyptic number.

20305857400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20305857400 is an abundant number, since it is smaller than the sum of its proper divisors (29682394040).

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

20305857400 is a wasteful number, since it uses less digits than its factorization.

20305857400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5972344 (or 5972335 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 20305857400 in words is "twenty billion, three hundred five million, eight hundred fifty-seven thousand, four hundred".