20817399394 has 16 divisors (see below), whose sum is σ = 34068340800. Its totient is φ = 9461480560.

The previous prime is 20817399373. The next prime is 20817399401. The reversal of 20817399394 is 49399371802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197667 + ... + 284089.

It is an arithmetic number, because the mean of its divisors is an integer number (2129271300).

Almost surely, 2^20817399394 is an apocalyptic number.

20817399394 is a deficient number, since it is larger than the sum of its proper divisors (13250941406).

20817399394 is a wasteful number, since it uses less digits than its factorization.

20817399394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97385.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 20817399394 in words is "twenty billion, eight hundred seventeen million, three hundred ninety-nine thousand, three hundred ninety-four".