20021023000 has 96 divisors (see below), whose sum is σ = 51495706080. Its totient is φ = 7280328000.

The previous prime is 20021022991. The next prime is 20021023021. The reversal of 20021023000 is 32012002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38269 + ... + 203731.

It is an arithmetic number, because the mean of its divisors is an integer number (536413605).

Almost surely, 2^20021023000 is an apocalyptic number.

20021023000 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 20021023000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25747853040).

20021023000 is an abundant number, since it is smaller than the sum of its proper divisors (31474683080).

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

20021023000 is a wasteful number, since it uses less digits than its factorization.

20021023000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165506 (or 165481 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 20021023000 its reverse (32012002), we get a palindrome (20053035002).

The spelling of 20021023000 in words is "twenty billion, twenty-one million, twenty-three thousand".