20397810794 has 48 divisors (see below), whose sum is σ = 32186306880. Its totient is φ = 9693720960.

The previous prime is 20397810781. The next prime is 20397810841. The reversal of 20397810794 is 49701879302.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48681917 + ... + 48682335.

It is an arithmetic number, because the mean of its divisors is an integer number (670548060).

Almost surely, 2^20397810794 is an apocalyptic number.

20397810794 is a deficient number, since it is larger than the sum of its proper divisors (11788496086).

20397810794 is a wasteful number, since it uses less digits than its factorization.

20397810794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 20397810794 in words is "twenty billion, three hundred ninety-seven million, eight hundred ten thousand, seven hundred ninety-four".