20515425 has 48 divisors (see below), whose sum is σ = 40473600. Its totient is φ = 8965440.

The previous prime is 20515393. The next prime is 20515463. The reversal of 20515425 is 52451502.

It is a happy number.

It is not a de Polignac number, because 20515425 - 2⁵ = 20515393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20515395 and 20515404.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11226 + ... + 12924.

It is an arithmetic number, because the mean of its divisors is an integer number (843200).

Almost surely, 2^20515425 is an apocalyptic number.

20515425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20515425 is a deficient number, since it is larger than the sum of its proper divisors (19958175).

20515425 is a wasteful number, since it uses less digits than its factorization.

20515425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742 (or 1737 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 20515425 is about 4529.3956550516. The cubic root of 20515425 is about 273.7538103346.

Adding to 20515425 its reverse (52451502), we get a palindrome (72966927).

The spelling of 20515425 in words is "twenty million, five hundred fifteen thousand, four hundred twenty-five".