20990085902 has 16 divisors (see below), whose sum is σ = 31623262272. Its totient is φ = 10449039360.

The previous prime is 20990085901. The next prime is 20990085911. The reversal of 20990085902 is 20958009902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20990085901) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1163483 + ... + 1181385.

It is an arithmetic number, because the mean of its divisors is an integer number (1976453892).

Almost surely, 2^20990085902 is an apocalyptic number.

20990085902 is a deficient number, since it is larger than the sum of its proper divisors (10633176370).

20990085902 is a wasteful number, since it uses less digits than its factorization.

20990085902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20443.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 20990085902 in words is "twenty billion, nine hundred ninety million, eighty-five thousand, nine hundred two".