20909515822 has 16 divisors (see below), whose sum is σ = 33779837952. Its totient is φ = 9649709280.

The previous prime is 20909515777. The next prime is 20909515853. The reversal of 20909515822 is 22851590902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351808 + ... + 406924.

It is an arithmetic number, because the mean of its divisors is an integer number (2111239872).

Almost surely, 2^20909515822 is an apocalyptic number.

20909515822 is a deficient number, since it is larger than the sum of its proper divisors (12870322130).

20909515822 is a wasteful number, since it uses less digits than its factorization.

20909515822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69723.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 20909515822 in words is "twenty billion, nine hundred nine million, five hundred fifteen thousand, eight hundred twenty-two".