20021011000 has 128 divisors (see below), whose sum is σ = 47870222400. Its totient is φ = 7835788800.

The previous prime is 20021010983. The next prime is 20021011007. The reversal of 20021011000 is 11012002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021011007) 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, 9045894 + ... + 9048106.

Almost surely, 2^20021011000 is an apocalyptic number.

20021011000 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 20021011000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23935111200).

20021011000 is an abundant number, since it is smaller than the sum of its proper divisors (27849211400).

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

20021011000 is a wasteful number, since it uses less digits than its factorization.

20021011000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426 (or 2412 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20021011000 its reverse (11012002), we get a palindrome (20032023002).

The spelling of 20021011000 in words is "twenty billion, twenty-one million, eleven thousand".