20725025 has 6 divisors (see below), whose sum is σ = 25699062. Its totient is φ = 16580000.

The previous prime is 20725013. The next prime is 20725037. The reversal of 20725025 is 52052702.

It is an interprime number because it is at equal distance from previous prime (20725013) and next prime (20725037).

It can be written as a sum of positive squares in 3 ways, for example, as 1915456 + 18809569 = 1384^2 + 4337^2 .

It is not a de Polignac number, because 20725025 - 2⁴ = 20725009 is a prime.

It is a super-2 number, since 2×20725025² = 859053322501250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 414476 + ... + 414525.

It is an arithmetic number, because the mean of its divisors is an integer number (4283177).

Almost surely, 2^20725025 is an apocalyptic number.

20725025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20725025 is a deficient number, since it is larger than the sum of its proper divisors (4974037).

20725025 is an equidigital number, since it uses as much as digits as its factorization.

20725025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829011 (or 829006 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 20725025 is about 4552.4746017963. The cubic root of 20725025 is about 274.6829403736.

Adding to 20725025 its reverse (52052702), we get a palindrome (72777727).

The spelling of 20725025 in words is "twenty million, seven hundred twenty-five thousand, twenty-five".