20494672690 has 8 divisors (see below), whose sum is σ = 36890410860. Its totient is φ = 8197869072.

The previous prime is 20494672613. The next prime is 20494672691. The reversal of 20494672690 is 9627649402.

It can be written as a sum of positive squares in 2 ways, for example, as 20300265441 + 194407249 = 142479^2 + 13943^2 .

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

It is a super-2 number, since 2×20494672690² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20494672691) 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 3 ways as a sum of consecutive naturals, for example, 1024733625 + ... + 1024733644.

Almost surely, 2^20494672690 is an apocalyptic number.

20494672690 is a deficient number, since it is larger than the sum of its proper divisors (16395738170).

20494672690 is a wasteful number, since it uses less digits than its factorization.

20494672690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049467276.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 20494672690 in words is "twenty billion, four hundred ninety-four million, six hundred seventy-two thousand, six hundred ninety".