20355878169 has 24 divisors (see below), whose sum is σ = 32681143872. Its totient is φ = 12104121120.

The previous prime is 20355878141. The next prime is 20355878189. The reversal of 20355878169 is 96187855302.

20355878169 is a `hidden beast` number, since 2 + 0 + 3 + 558 + 7 + 81 + 6 + 9 = 666.

It is not a de Polignac number, because 20355878169 - 2²⁵ = 20322323737 is a prime.

It is a super-2 number, since 2×20355878169² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20355878119) 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 23 ways as a sum of consecutive naturals, for example, 1934517 + ... + 1945010.

It is an arithmetic number, because the mean of its divisors is an integer number (1361714328).

Almost surely, 2^20355878169 is an apocalyptic number.

It is an amenable number.

20355878169 is a deficient number, since it is larger than the sum of its proper divisors (12325265703).

20355878169 is a wasteful number, since it uses less digits than its factorization.

20355878169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879597 (or 3879594 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 20355878169 in words is "twenty billion, three hundred fifty-five million, eight hundred seventy-eight thousand, one hundred sixty-nine".