20903525 has 12 divisors (see below), whose sum is σ = 25977504. Its totient is φ = 16686000.

The previous prime is 20903513. The next prime is 20903549. The reversal of 20903525 is 52530902.

It is a de Polignac number, because none of the positive numbers 2^k-20903525 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20903494 and 20903503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19760 + ... + 20790.

It is an arithmetic number, because the mean of its divisors is an integer number (2164792).

Almost surely, 2^20903525 is an apocalyptic number.

20903525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20903525 is a deficient number, since it is larger than the sum of its proper divisors (5073979).

20903525 is a wasteful number, since it uses less digits than its factorization.

20903525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852 (or 1847 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 20903525 is about 4572.0372920614. The cubic root of 20903525 is about 275.4692813709.

The spelling of 20903525 in words is "twenty million, nine hundred three thousand, five hundred twenty-five".