20964203977 has 8 divisors (see below), whose sum is σ = 21172169376. Its totient is φ = 20756632512.

The previous prime is 20964203947. The next prime is 20964204017. The reversal of 20964203977 is 77930246902.

It is a happy number.

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 20964203977 - 2¹⁹ = 20963679689 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 20964203977.

It is not an unprimeable number, because it can be changed into a prime (20964203947) 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, 9058 + ... + 204964.

It is an arithmetic number, because the mean of its divisors is an integer number (2646521172).

Almost surely, 2^20964203977 is an apocalyptic number.

It is an amenable number.

20964203977 is a deficient number, since it is larger than the sum of its proper divisors (207965399).

20964203977 is a wasteful number, since it uses less digits than its factorization.

20964203977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196967.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The spelling of 20964203977 in words is "twenty billion, nine hundred sixty-four million, two hundred three thousand, nine hundred seventy-seven".