20669377358690 has 16 divisors (see below), whose sum is σ = 38112315325560. Its totient is φ = 8066098481280.

The previous prime is 20669377358683. The next prime is 20669377358719. The reversal of 20669377358690 is 9685377396602.

It can be written as a sum of positive squares in 4 ways, for example, as 17108423430289 + 3560953928401 = 4136233^2 + 1887049^2 .

It is a super-2 number, since 2×20669377358690² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25206557345 + ... + 25206558164.

Almost surely, 2^{20669377358690} is an apocalyptic number.

20669377358690 is a deficient number, since it is larger than the sum of its proper divisors (17442937966870).

20669377358690 is a wasteful number, since it uses less digits than its factorization.

20669377358690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50413115557.

The product of its (nonzero) digits is 617258880, while the sum is 71.

The spelling of 20669377358690 in words is "twenty trillion, six hundred sixty-nine billion, three hundred seventy-seven million, three hundred fifty-eight thousand, six hundred ninety".