20385390520 has 64 divisors (see below), whose sum is σ = 50783760000. Its totient is φ = 7302218880.

The previous prime is 20385390517. The next prime is 20385390541. The reversal of 20385390520 is 2509358302.

It is a self number, because there is not a number n which added to its sum of digits gives 20385390520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316270 + ... + 375229.

It is an arithmetic number, because the mean of its divisors is an integer number (793496250).

Almost surely, 2^20385390520 is an apocalyptic number.

20385390520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20385390520 is an abundant number, since it is smaller than the sum of its proper divisors (30398369480).

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

20385390520 is a wasteful number, since it uses less digits than its factorization.

20385390520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691588 (or 691584 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 20385390520 in words is "twenty billion, three hundred eighty-five million, three hundred ninety thousand, five hundred twenty".