20910977077 has 8 divisors (see below), whose sum is σ = 21120952320. Its totient is φ = 20701059600.

The previous prime is 20910977069. The next prime is 20910977123. The reversal of 20910977077 is 77077901902.

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 20910977077 - 2³ = 20910977069 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 20910977077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20910977027) 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, 1421124 + ... + 1435762.

It is an arithmetic number, because the mean of its divisors is an integer number (2640119040).

Almost surely, 2^20910977077 is an apocalyptic number.

It is an amenable number.

20910977077 is a deficient number, since it is larger than the sum of its proper divisors (209975243).

20910977077 is a wasteful number, since it uses less digits than its factorization.

20910977077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28883.

The product of its (nonzero) digits is 388962, while the sum is 49.

The spelling of 20910977077 in words is "twenty billion, nine hundred ten million, nine hundred seventy-seven thousand, seventy-seven".