20794420591 has 16 divisors (see below), whose sum is σ = 25822812160. Its totient is φ = 16340991840.

The previous prime is 20794420567. The next prime is 20794420649. The reversal of 20794420591 is 19502449702.

It is a cyclic number.

It is not a de Polignac number, because 20794420591 - 2⁹ = 20794420079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20794420511) 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, 2517636 + ... + 2525881.

It is an arithmetic number, because the mean of its divisors is an integer number (1613925760).

Almost surely, 2^20794420591 is an apocalyptic number.

20794420591 is a deficient number, since it is larger than the sum of its proper divisors (5028391569).

20794420591 is a wasteful number, since it uses less digits than its factorization.

20794420591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043574.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 20794420591 in words is "twenty billion, seven hundred ninety-four million, four hundred twenty thousand, five hundred ninety-one".