20315425 has 24 divisors (see below), whose sum is σ = 28732536. Its totient is φ = 14115840.

The previous prime is 20315423. The next prime is 20315429. The reversal of 20315425 is 52451302.

It can be written as a sum of positive squares in 12 ways, for example, as 3415104 + 16900321 = 1848^2 + 4111^2 .

It is not a de Polignac number, because 20315425 - 2¹ = 20315423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20315396 and 20315405.

It is not an unprimeable number, because it can be changed into a prime (20315423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3687 + ... + 7363.

It is an arithmetic number, because the mean of its divisors is an integer number (1197189).

Almost surely, 2^20315425 is an apocalyptic number.

20315425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20315425 is a deficient number, since it is larger than the sum of its proper divisors (8417111).

20315425 is a wasteful number, since it uses less digits than its factorization.

20315425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3717 (or 3712 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20315425 is about 4507.2635822636. The cubic root of 20315425 is about 272.8613168513.

Adding to 20315425 its reverse (52451302), we get a palindrome (72766727).

The spelling of 20315425 in words is "twenty million, three hundred fifteen thousand, four hundred twenty-five".