1300000020 has 96 divisors (see below), whose sum is σ = 4143605760. Its totient is φ = 301445760.

The previous prime is 1300000003. The next prime is 1300000021. The reversal of 1300000020 is 200000031.

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 = 1299999954 and 1300000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300000021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27640 + ... + 57999.

It is an arithmetic number, because the mean of its divisors is an integer number (43162560).

Almost surely, 2^1300000020 is an apocalyptic number.

1300000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1300000020 is an abundant number, since it is smaller than the sum of its proper divisors (2843605740).

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

1300000020 is a wasteful number, since it uses less digits than its factorization.

1300000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85685 (or 85683 counting only the distinct ones).

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

The square root of 1300000020 is about 36055.5130319900. The cubic root of 1300000020 is about 1091.3928886580.

Adding to 1300000020 its reverse (200000031), we get a palindrome (1500000051).

The spelling of 1300000020 in words is "one billion, three hundred million, twenty", and thus it is an aban number.