1210000020 has 24 divisors (see below), whose sum is σ = 3388000224. Its totient is φ = 322666656.

The previous prime is 1210000013. The next prime is 1210000021. The reversal of 1210000020 is 200000121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 1209999963 and 1210000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210000021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10083274 + ... + 10083393.

It is an arithmetic number, because the mean of its divisors is an integer number (141166676).

Almost surely, 2^1210000020 is an apocalyptic number.

1210000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210000020 is an abundant number, since it is smaller than the sum of its proper divisors (2178000204).

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

1210000020 is a wasteful number, since it uses less digits than its factorization.

1210000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20166679 (or 20166677 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1210000020 is about 34785.0545493320. The cubic root of 1210000020 is about 1065.6022426377.

Adding to 1210000020 its reverse (200000121), we get a palindrome (1410000141).

The spelling of 1210000020 in words is "one billion, two hundred ten million, twenty", and thus it is an aban number.