20251240125 has 64 divisors (see below), whose sum is σ = 35113478400. Its totient is φ = 10352428800.

The previous prime is 20251240111. The next prime is 20251240129. The reversal of 20251240125 is 52104215202.

It is not a de Polignac number, because 20251240125 - 2¹³ = 20251231933 is a prime.

It is a super-2 number, since 2×20251240125² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20251240095 and 20251240104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251240129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1504927 + ... + 1518323.

It is an arithmetic number, because the mean of its divisors is an integer number (548648100).

Almost surely, 2^20251240125 is an apocalyptic number.

20251240125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20251240125 is a deficient number, since it is larger than the sum of its proper divisors (14862238275).

20251240125 is a wasteful number, since it uses less digits than its factorization.

20251240125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13583 (or 13573 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 20251240125 its reverse (52104215202), we get a palindrome (72355455327).

The spelling of 20251240125 in words is "twenty billion, two hundred fifty-one million, two hundred forty thousand, one hundred twenty-five".