20492490905 has 8 divisors (see below), whose sum is σ = 24652933512. Its totient is φ = 16352696448.

The previous prime is 20492490899. The next prime is 20492490913. The reversal of 20492490905 is 50909429402.

It can be written as a sum of positive squares in 4 ways, for example, as 1113623641 + 19378867264 = 33371^2 + 139208^2 .

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 20492490905 - 2⁶ = 20492490841 is a prime.

It is a Duffinian number.

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, 5159852 + ... + 5163821.

It is an arithmetic number, because the mean of its divisors is an integer number (3081616689).

Almost surely, 2^20492490905 is an apocalyptic number.

It is an amenable number.

20492490905 is a deficient number, since it is larger than the sum of its proper divisors (4160442607).

20492490905 is a wasteful number, since it uses less digits than its factorization.

20492490905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324075.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 20492490905 in words is "twenty billion, four hundred ninety-two million, four hundred ninety thousand, nine hundred five".