1222000020 has 120 divisors (see below), whose sum is σ = 3851505504. Its totient is φ = 324333504.

The previous prime is 1222000009. The next prime is 1222000037. The reversal of 1222000020 is 200002221.

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 = 1221999966 and 1222000011.

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, 366079 + ... + 369401.

Almost surely, 2^1222000020 is an apocalyptic number.

1222000020 is a gapful number since it is divisible by the number (10) 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 1222000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1925752752).

1222000020 is an abundant number, since it is smaller than the sum of its proper divisors (2629505484).

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

1222000020 is a wasteful number, since it uses less digits than its factorization.

1222000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571 (or 3560 counting only the distinct ones).

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

The square root of 1222000020 is about 34957.1168719619. The cubic root of 1222000020 is about 1069.1133132303.

Adding to 1222000020 its reverse (200002221), we get a palindrome (1422002241).

The spelling of 1222000020 in words is "one billion, two hundred twenty-two million, twenty", and thus it is an aban number.