20958973643 has 8 divisors (see below), whose sum is σ = 21166755168. Its totient is φ = 20751274944.

The previous prime is 20958973597. The next prime is 20958973657. The reversal of 20958973643 is 34637985902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20958973643 - 2¹⁴ = 20958957259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20958973843) 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, 571055 + ... + 606647.

It is an arithmetic number, because the mean of its divisors is an integer number (2645844396).

Almost surely, 2^20958973643 is an apocalyptic number.

20958973643 is a deficient number, since it is larger than the sum of its proper divisors (207781525).

20958973643 is a wasteful number, since it uses less digits than its factorization.

20958973643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41413.

The product of its (nonzero) digits is 9797760, while the sum is 56.

The spelling of 20958973643 in words is "twenty billion, nine hundred fifty-eight million, nine hundred seventy-three thousand, six hundred forty-three".