20523417 has 4 divisors (see below), whose sum is σ = 27364560. Its totient is φ = 13682276.

The previous prime is 20523407. The next prime is 20523421. The reversal of 20523417 is 71432502.

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 a cyclic number.

It is not a de Polignac number, because 20523417 - 2⁷ = 20523289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20523407) 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, 3420567 + ... + 3420572.

It is an arithmetic number, because the mean of its divisors is an integer number (6841140).

Almost surely, 2^20523417 is an apocalyptic number.

It is an amenable number.

20523417 is a deficient number, since it is larger than the sum of its proper divisors (6841143).

20523417 is an equidigital number, since it uses as much as digits as its factorization.

20523417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6841142.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20523417 is about 4530.2778060512. The cubic root of 20523417 is about 273.7893536134.

Adding to 20523417 its reverse (71432502), we get a palindrome (91955919).

The spelling of 20523417 in words is "twenty million, five hundred twenty-three thousand, four hundred seventeen".