20809164730 has 16 divisors (see below), whose sum is σ = 37492565760. Its totient is φ = 8315650512.

The previous prime is 20809164707. The next prime is 20809164731. The reversal of 20809164730 is 3746190802.

It is not an unprimeable number, because it can be changed into a prime (20809164731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991014 + ... + 1011793.

It is an arithmetic number, because the mean of its divisors is an integer number (2343285360).

Almost surely, 2^20809164730 is an apocalyptic number.

20809164730 is a deficient number, since it is larger than the sum of its proper divisors (16683401030).

20809164730 is a wasteful number, since it uses less digits than its factorization.

20809164730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003853.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 20809164730 in words is "twenty billion, eight hundred nine million, one hundred sixty-four thousand, seven hundred thirty".