20949777530 has 32 divisors (see below), whose sum is σ = 43302893760. Its totient is φ = 7217147520.

The previous prime is 20949777517. The next prime is 20949777553. The reversal of 20949777530 is 3577794902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5009819 + ... + 5013998.

It is an arithmetic number, because the mean of its divisors is an integer number (1353215430).

Almost surely, 2^20949777530 is an apocalyptic number.

20949777530 is an abundant number, since it is smaller than the sum of its proper divisors (22353116230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20949777530 is a wasteful number, since it uses less digits than its factorization.

20949777530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10023854.

The product of its (nonzero) digits is 3333960, while the sum is 53.

The spelling of 20949777530 in words is "twenty billion, nine hundred forty-nine million, seven hundred seventy-seven thousand, five hundred thirty".