1020220000020 has 72 divisors (see below), whose sum is σ = 3332718674376. Its totient is φ = 251131076352.

The previous prime is 1020219999919. The next prime is 1020220000091. The reversal of 1020220000020 is 200000220201.

It can be written as a sum of positive squares in 4 ways, for example, as 19171725444 + 1001048274576 = 138462^2 + 1000524^2 .

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 = 1020219999957 and 1020220000011.

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, 217993387 + ... + 217998066.

Almost surely, 2^{1020220000020} is an apocalyptic number.

1020220000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020220000020 is an abundant number, since it is smaller than the sum of its proper divisors (2312498674356).

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

1020220000020 is a wasteful number, since it uses less digits than its factorization.

1020220000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435991481 (or 435991476 counting only the distinct ones).

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

Adding to 1020220000020 its reverse (200000220201), we get a palindrome (1220220220221).

The spelling of 1020220000020 in words is "one trillion, twenty billion, two hundred twenty million, twenty", and thus it is an aban number.