20402525 has 36 divisors (see below), whose sum is σ = 29953440. Its totient is φ = 13665600.

The previous prime is 20402521. The next prime is 20402531. The reversal of 20402525 is 52520402.

It is not a de Polignac number, because 20402525 - 2² = 20402521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20402497 and 20402506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402521) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 46256 + ... + 46694.

It is an arithmetic number, because the mean of its divisors is an integer number (832040).

Almost surely, 2^20402525 is an apocalyptic number.

20402525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20402525 is a deficient number, since it is larger than the sum of its proper divisors (9550915).

20402525 is a wasteful number, since it uses less digits than its factorization.

20402525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20402525 is about 4516.9154298038. The cubic root of 20402525 is about 273.2507145037.

Adding to 20402525 its reverse (52520402), we get a palindrome (72922927).

The spelling of 20402525 in words is "twenty million, four hundred two thousand, five hundred twenty-five".