20271640973 has 16 divisors (see below), whose sum is σ = 21978988416. Its totient is φ = 18622141440.

The previous prime is 20271640943. The next prime is 20271640979. The reversal of 20271640973 is 37904617202.

It is a cyclic number.

It is not a de Polignac number, because 20271640973 - 2⁸ = 20271640717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20271640973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20271640979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1095365 + ... + 1113717.

It is an arithmetic number, because the mean of its divisors is an integer number (1373686776).

Almost surely, 2^20271640973 is an apocalyptic number.

It is an amenable number.

20271640973 is a deficient number, since it is larger than the sum of its proper divisors (1707347443).

20271640973 is a wasteful number, since it uses less digits than its factorization.

20271640973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19924.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 20271640973 in words is "twenty billion, two hundred seventy-one million, six hundred forty thousand, nine hundred seventy-three".