20331671808 has 288 divisors, whose sum is σ = 63176802304. Its totient is φ = 5685313536.

The previous prime is 20331671807. The next prime is 20331671809. The reversal of 20331671808 is 80817613302.

It is an interprime number because it is at equal distance from previous prime (20331671807) and next prime (20331671809).

It is not an unprimeable number, because it can be changed into a prime (20331671803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66226791 + ... + 66227097.

Almost surely, 2^20331671808 is an apocalyptic number.

20331671808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20331671808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31588401152).

20331671808 is an abundant number, since it is smaller than the sum of its proper divisors (42845130496).

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

20331671808 is a wasteful number, since it uses less digits than its factorization.

20331671808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 20331671808 in words is "twenty billion, three hundred thirty-one million, six hundred seventy-one thousand, eight hundred eight".