20312981890 has 32 divisors (see below), whose sum is σ = 38513160000. Its totient is φ = 7692470208.

The previous prime is 20312981881. The next prime is 20312981891. The reversal of 20312981890 is 9818921302.

It is not an unprimeable number, because it can be changed into a prime (20312981891) 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 15 ways as a sum of consecutive naturals, for example, 259801 + ... + 328819.

It is an arithmetic number, because the mean of its divisors is an integer number (1203536250).

Almost surely, 2^20312981890 is an apocalyptic number.

20312981890 is a deficient number, since it is larger than the sum of its proper divisors (18200178110).

20312981890 is a wasteful number, since it uses less digits than its factorization.

20312981890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70594.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 20312981890 in words is "twenty billion, three hundred twelve million, nine hundred eighty-one thousand, eight hundred ninety".