1251432020 has 12 divisors (see below), whose sum is σ = 2628007284. Its totient is φ = 500572800.

The previous prime is 1251431989. The next prime is 1251432023. The reversal of 1251432020 is 202341521.

It can be written as a sum of positive squares in 2 ways, for example, as 902041156 + 349390864 = 30034^2 + 18692^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 62571601 = 1251432020 / (1 + 2 + 5 + 1 + 4 + 3 + 2 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1251431983 and 1251432001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251432023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31285781 + ... + 31285820.

It is an arithmetic number, because the mean of its divisors is an integer number (219000607).

Almost surely, 2^1251432020 is an apocalyptic number.

1251432020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251432020 is an abundant number, since it is smaller than the sum of its proper divisors (1376575264).

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

1251432020 is a wasteful number, since it uses less digits than its factorization.

1251432020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62571610 (or 62571608 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1251432020 is about 35375.5850835007. The cubic root of 1251432020 is about 1077.6285471713.

Adding to 1251432020 its reverse (202341521), we get a palindrome (1453773541).

The spelling of 1251432020 in words is "one billion, two hundred fifty-one million, four hundred thirty-two thousand, twenty".