1200001012020 has 72 divisors (see below), whose sum is σ = 3640503460776. Its totient is φ = 319956279552.

The previous prime is 1200001012013. The next prime is 1200001012099. The reversal of 1200001012020 is 202101000021.

It can be written as a sum of positive squares in 4 ways, for example, as 13269657636 + 1186731354384 = 115194^2 + 1089372^2 .

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 = 1200001011993 and 1200001012011.

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, 865374 + ... + 1774506.

Almost surely, 2^{1200001012020} is an apocalyptic number.

1200001012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200001012020 is an abundant number, since it is smaller than the sum of its proper divisors (2440502448756).

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

1200001012020 is a wasteful number, since it uses less digits than its factorization.

1200001012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916481 (or 916476 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200001012020 its reverse (202101000021), we get a palindrome (1402102012041).

The spelling of 1200001012020 in words is "one trillion, two hundred billion, one million, twelve thousand, twenty".