20385750840 has 128 divisors (see below), whose sum is σ = 75270504960. Its totient is φ = 4301167104.

The previous prime is 20385750823. The next prime is 20385750851. The reversal of 20385750840 is 4805758302.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 20385750792 and 20385750801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 922494 + ... + 944333.

It is an arithmetic number, because the mean of its divisors is an integer number (588050820).

Almost surely, 2^20385750840 is an apocalyptic number.

20385750840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20385750840 is an abundant number, since it is smaller than the sum of its proper divisors (54884754120).

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

20385750840 is a wasteful number, since it uses less digits than its factorization.

20385750840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866861 (or 1866857 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 20385750840 in words is "twenty billion, three hundred eighty-five million, seven hundred fifty thousand, eight hundred forty".