20490923577 has 8 divisors (see below), whose sum is σ = 27322004416. Its totient is φ = 13660229232.

The previous prime is 20490923569. The next prime is 20490923603. The reversal of 20490923577 is 77532909402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20490923577 - 2³ = 20490923569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20490923177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66363 + ... + 213039.

It is an arithmetic number, because the mean of its divisors is an integer number (3415250552).

Almost surely, 2^20490923577 is an apocalyptic number.

It is an amenable number.

20490923577 is a deficient number, since it is larger than the sum of its proper divisors (6831080839).

20490923577 is a wasteful number, since it uses less digits than its factorization.

20490923577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193247.

The product of its (nonzero) digits is 952560, while the sum is 48.

The spelling of 20490923577 in words is "twenty billion, four hundred ninety million, nine hundred twenty-three thousand, five hundred seventy-seven".