20381167578740 has 48 divisors (see below), whose sum is σ = 45053836464000. Its totient is φ = 7723264816512.

The previous prime is 20381167578731. The next prime is 20381167578743. The reversal of 20381167578740 is 4787576118302.

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 20381167578740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381167578743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25040057 + ... + 25841183.

It is an arithmetic number, because the mean of its divisors is an integer number (938621593000).

Almost surely, 2^{20381167578740} is an apocalyptic number.

20381167578740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20381167578740 is an abundant number, since it is smaller than the sum of its proper divisors (24672668885260).

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

20381167578740 is a wasteful number, since it uses less digits than its factorization.

20381167578740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868104 (or 868102 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 20381167578740 in words is "twenty trillion, three hundred eighty-one billion, one hundred sixty-seven million, five hundred seventy-eight thousand, seven hundred forty".