20221000020 has 72 divisors (see below), whose sum is σ = 66055274376. Its totient is φ = 4977476352.

The previous prime is 20220999973. The next prime is 20221000061. The reversal of 20221000020 is 2000012202.

It can be written as a sum of positive squares in 4 ways, for example, as 2385931716 + 17835068304 = 48846^2 + 133548^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20220999966 and 20221000011.

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, 4318387 + ... + 4323066.

Almost surely, 2^20221000020 is an apocalyptic number.

20221000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20221000020 is an abundant number, since it is smaller than the sum of its proper divisors (45834274356).

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

20221000020 is a wasteful number, since it uses less digits than its factorization.

20221000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8641481 (or 8641476 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20221000020 its reverse (2000012202), we get a palindrome (22221012222).

The spelling of 20221000020 in words is "twenty billion, two hundred twenty-one million, twenty", and thus it is an aban number.