20928425 has 12 divisors (see below), whose sum is σ = 29658816. Its totient is φ = 14350800.

The previous prime is 20928419. The next prime is 20928431. The reversal of 20928425 is 52482902.

It is an interprime number because it is at equal distance from previous prime (20928419) and next prime (20928431).

It is not a de Polignac number, because 20928425 - 2⁶ = 20928361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20928391 and 20928400.

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, 59621 + ... + 59970.

It is an arithmetic number, because the mean of its divisors is an integer number (2471568).

Almost surely, 2^20928425 is an apocalyptic number.

20928425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20928425 is a deficient number, since it is larger than the sum of its proper divisors (8730391).

20928425 is a wasteful number, since it uses less digits than its factorization.

20928425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119608 (or 119603 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20928425 is about 4574.7595565232. The cubic root of 20928425 is about 275.5786164134.

The spelling of 20928425 in words is "twenty million, nine hundred twenty-eight thousand, four hundred twenty-five".