20331000 has 160 divisors (see below), whose sum is σ = 71351280. Its totient is φ = 5400000.

The previous prime is 20330993. The next prime is 20331023. The reversal of 20331000 is 13302.

It is a happy number.

It is a super-2 number, since 2×20331000² = 826699122000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 80875 + ... + 81125.

Almost surely, 2^20331000 is an apocalyptic number.

20331000 is a gapful number since it is divisible by the number (20) 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 20331000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35675640).

20331000 is an abundant number, since it is smaller than the sum of its proper divisors (51020280).

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

20331000 is a wasteful number, since it uses less digits than its factorization.

20331000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 20331000 is about 4508.9910179551. The cubic root of 20331000 is about 272.9310295518.

Adding to 20331000 its reverse (13302), we get a palindrome (20344302).

The spelling of 20331000 in words is "twenty million, three hundred thirty-one thousand".