20311259868 has 24 divisors (see below), whose sum is σ = 52658822160. Its totient is φ = 6770419920.

The previous prime is 20311259851. The next prime is 20311259951. The reversal of 20311259868 is 86895211302.

20311259868 is a `hidden beast` number, since 2 + 0 + 311 + 259 + 86 + 8 = 666.

It is a super-4 number, since 4×20311259868⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94033503 + ... + 94033718.

It is an arithmetic number, because the mean of its divisors is an integer number (2194117590).

Almost surely, 2^20311259868 is an apocalyptic number.

It is an amenable number.

20311259868 is an abundant number, since it is smaller than the sum of its proper divisors (32347562292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311259868 is a wasteful number, since it uses less digits than its factorization.

20311259868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188067234 (or 188067226 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 20311259868 in words is "twenty billion, three hundred eleven million, two hundred fifty-nine thousand, eight hundred sixty-eight".