1251023020 has 48 divisors (see below), whose sum is σ = 2877225120. Its totient is φ = 454081536.

The previous prime is 1251023003. The next prime is 1251023029. The reversal of 1251023020 is 203201521.

It is a junction number, because it is equal to n+sod(n) for n = 1251022985 and 1251023003.

It is not an unprimeable number, because it can be changed into a prime (1251023029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25437 + ... + 56116.

It is an arithmetic number, because the mean of its divisors is an integer number (59942190).

Almost surely, 2^1251023020 is an apocalyptic number.

1251023020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251023020 is an abundant number, since it is smaller than the sum of its proper divisors (1626202100).

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

1251023020 is a wasteful number, since it uses less digits than its factorization.

1251023020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81634 (or 81632 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1251023020 is about 35369.8037879771. The cubic root of 1251023020 is about 1077.5111355198.

Adding to 1251023020 its reverse (203201521), we get a palindrome (1454224541).

The spelling of 1251023020 in words is "one billion, two hundred fifty-one million, twenty-three thousand, twenty".