25180420 has 24 divisors (see below), whose sum is σ = 53071704. Its totient is φ = 10035456.

The previous prime is 25180321. The next prime is 25180471. The reversal of 25180420 is 2408152.

It can be written as a sum of positive squares in 4 ways, for example, as 8386816 + 16793604 = 2896^2 + 4098^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25180391 and 25180400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3712 + ... + 8008.

It is an arithmetic number, because the mean of its divisors is an integer number (2211321).

Almost surely, 2^25180420 is an apocalyptic number.

25180420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25180420 is an abundant number, since it is smaller than the sum of its proper divisors (27891284).

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

25180420 is a wasteful number, since it uses less digits than its factorization.

25180420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4599 (or 4597 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 25180420 is about 5018.0095655549. The cubic root of 25180420 is about 293.1034901770.

Adding to 25180420 its reverse (2408152), we get a palindrome (27588572).

It can be divided in two parts, 25180 and 420, that added together give a square (25600 = 160²).

The spelling of 25180420 in words is "twenty-five million, one hundred eighty thousand, four hundred twenty".