20321831156 has 24 divisors (see below), whose sum is σ = 38980109280. Its totient is φ = 9193413600.

The previous prime is 20321831143. The next prime is 20321831227. The reversal of 20321831156 is 65113812302.

It is a super-3 number, since 3×20321831156³ (a number of 32 digits) contains 333 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1085171 + ... + 1103738.

It is an arithmetic number, because the mean of its divisors is an integer number (1624171220).

Almost surely, 2^20321831156 is an apocalyptic number.

It is an amenable number.

20321831156 is a deficient number, since it is larger than the sum of its proper divisors (18658278124).

20321831156 is a wasteful number, since it uses less digits than its factorization.

20321831156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189135 (or 2189133 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 20321831156 in words is "twenty billion, three hundred twenty-one million, eight hundred thirty-one thousand, one hundred fifty-six".