20925417 has 4 divisors (see below), whose sum is σ = 27900560. Its totient is φ = 13950276.

The previous prime is 20925389. The next prime is 20925433. The reversal of 20925417 is 71452902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20925417 - 2¹² = 20921321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20925467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3487567 + ... + 3487572.

It is an arithmetic number, because the mean of its divisors is an integer number (6975140).

Almost surely, 2^20925417 is an apocalyptic number.

It is an amenable number.

20925417 is a deficient number, since it is larger than the sum of its proper divisors (6975143).

20925417 is an equidigital number, since it uses as much as digits as its factorization.

20925417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6975142.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20925417 is about 4574.4307842616. The cubic root of 20925417 is about 275.5654129960.

The spelling of 20925417 in words is "twenty million, nine hundred twenty-five thousand, four hundred seventeen".