1250000020 has 12 divisors (see below), whose sum is σ = 2625000084. Its totient is φ = 500000000.

The previous prime is 1249999997. The next prime is 1250000027. The reversal of 1250000020 is 200000521.

It can be written as a sum of positive squares in 2 ways, for example, as 221771664 + 1028228356 = 14892^2 + 32066^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1249999961 and 1250000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1250000027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31249981 + ... + 31250020.

It is an arithmetic number, because the mean of its divisors is an integer number (218750007).

Almost surely, 2^1250000020 is an apocalyptic number.

1250000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1250000020 is an abundant number, since it is smaller than the sum of its proper divisors (1375000064).

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

1250000020 is a wasteful number, since it uses less digits than its factorization.

1250000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62500010 (or 62500008 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 1250000020 is about 35355.3393421701. The cubic root of 1250000020 is about 1077.2173507611.

Adding to 1250000020 its reverse (200000521), we get a palindrome (1450000541).

The spelling of 1250000020 in words is "one billion, two hundred fifty million, twenty", and thus it is an aban number.