20021031000 has 96 divisors (see below), whose sum is σ = 67671115200. Its totient is φ = 5338939200.

The previous prime is 20021030969. The next prime is 20021031029. The reversal of 20021031000 is 13012002.

It is a happy number.

It is a super-2 number, since 2×20021031000² (a number of 21 digits) 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 23 ways as a sum of consecutive naturals, for example, 1103280 + ... + 1121279.

It is an arithmetic number, because the mean of its divisors is an integer number (704907450).

Almost surely, 2^20021031000 is an apocalyptic number.

20021031000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021031000 is an abundant number, since it is smaller than the sum of its proper divisors (47650084200).

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

20021031000 is a wasteful number, since it uses less digits than its factorization.

20021031000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224586 (or 2224569 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20021031000 its reverse (13012002), we get a palindrome (20034043002).

The spelling of 20021031000 in words is "twenty billion, twenty-one million, thirty-one thousand".