20866090490 has 16 divisors (see below), whose sum is σ = 42924529152. Its totient is φ = 7154088144.

The previous prime is 20866090481. The next prime is 20866090519. The reversal of 20866090490 is 9409066802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149043434 + ... + 149043573.

It is an arithmetic number, because the mean of its divisors is an integer number (2682783072).

Almost surely, 2^20866090490 is an apocalyptic number.

20866090490 is an abundant number, since it is smaller than the sum of its proper divisors (22058438662).

20866090490 is a wasteful number, since it uses less digits than its factorization.

20866090490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298087021.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 20866090490 in words is "twenty billion, eight hundred sixty-six million, ninety thousand, four hundred ninety".