20423872569 has 12 divisors (see below), whose sum is σ = 28138617168. Its totient is φ = 13176690120.

The previous prime is 20423872561. The next prime is 20423872571. The reversal of 20423872569 is 96527832402.

It is not a de Polignac number, because 20423872569 - 2³ = 20423872561 is a prime.

It is a super-2 number, since 2×20423872569² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20423872561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3539239 + ... + 3545004.

It is an arithmetic number, because the mean of its divisors is an integer number (2344884764).

Almost surely, 2^20423872569 is an apocalyptic number.

It is an amenable number.

20423872569 is a deficient number, since it is larger than the sum of its proper divisors (7714744599).

20423872569 is an equidigital number, since it uses as much as digits as its factorization.

20423872569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084308 (or 7084277 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 20423872569 in words is "twenty billion, four hundred twenty-three million, eight hundred seventy-two thousand, five hundred sixty-nine".