1251940020 has 48 divisors (see below), whose sum is σ = 3689931840. Its totient is φ = 316279296.

The previous prime is 1251940013. The next prime is 1251940031. The reversal of 1251940020 is 200491521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547957 + ... + 550236.

It is an arithmetic number, because the mean of its divisors is an integer number (76873580).

Almost surely, 2^1251940020 is an apocalyptic number.

1251940020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251940020 is an abundant number, since it is smaller than the sum of its proper divisors (2437991820).

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

1251940020 is a wasteful number, since it uses less digits than its factorization.

1251940020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098224 (or 1098222 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1251940020 is about 35382.7644482451. The cubic root of 1251940020 is about 1077.7743431436.

The spelling of 1251940020 in words is "one billion, two hundred fifty-one million, nine hundred forty thousand, twenty".