20662992091 has 8 divisors (see below), whose sum is σ = 25003956960. Its totient is φ = 16669304448.

The previous prime is 20662992071. The next prime is 20662992107. The reversal of 20662992091 is 19029926602.

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 20662992091 - 2⁷ = 20662991963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20662992071) 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, 86819176 + ... + 86819413.

It is an arithmetic number, because the mean of its divisors is an integer number (3125494620).

Almost surely, 2^20662992091 is an apocalyptic number.

20662992091 is a deficient number, since it is larger than the sum of its proper divisors (4340964869).

20662992091 is a wasteful number, since it uses less digits than its factorization.

20662992091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173638613.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 20662992091 in words is "twenty billion, six hundred sixty-two million, nine hundred ninety-two thousand, ninety-one".