20391293380 has 24 divisors (see below), whose sum is σ = 42840342720. Its totient is φ = 8152969440.

The previous prime is 20391293359. The next prime is 20391293381. The reversal of 20391293380 is 8339219302.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20391293381) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 174370 + ... + 266809.

It is an arithmetic number, because the mean of its divisors is an integer number (1785014280).

Almost surely, 2^20391293380 is an apocalyptic number.

20391293380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20391293380 is an abundant number, since it is smaller than the sum of its proper divisors (22449049340).

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

20391293380 is a wasteful number, since it uses less digits than its factorization.

20391293380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443499 (or 443497 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 20391293380 in words is "twenty billion, three hundred ninety-one million, two hundred ninety-three thousand, three hundred eighty".