20347087940 has 12 divisors (see below), whose sum is σ = 42728884716. Its totient is φ = 8138835168.

The previous prime is 20347087939. The next prime is 20347087949. The reversal of 20347087940 is 4978074302.

It can be written as a sum of positive squares in 2 ways, for example, as 14813810944 + 5533276996 = 121712^2 + 74386^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20347087891 and 20347087900.

It is not an unprimeable number, because it can be changed into a prime (20347087949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508677179 + ... + 508677218.

It is an arithmetic number, because the mean of its divisors is an integer number (3560740393).

Almost surely, 2^20347087940 is an apocalyptic number.

20347087940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20347087940 is an abundant number, since it is smaller than the sum of its proper divisors (22381796776).

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

20347087940 is a wasteful number, since it uses less digits than its factorization.

20347087940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017354406 (or 1017354404 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 20347087940 in words is "twenty billion, three hundred forty-seven million, eighty-seven thousand, nine hundred forty".