20695457 has 4 divisors (see below), whose sum is σ = 20772096. Its totient is φ = 20618820.

The previous prime is 20695453. The next prime is 20695459. The reversal of 20695457 is 75459602.

It is a happy number.

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 20695457 - 2² = 20695453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20695457.

It is not an unprimeable number, because it can be changed into a prime (20695453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37913 + ... + 38454.

It is an arithmetic number, because the mean of its divisors is an integer number (5193024).

Almost surely, 2^20695457 is an apocalyptic number.

It is an amenable number.

20695457 is a deficient number, since it is larger than the sum of its proper divisors (76639).

20695457 is an equidigital number, since it uses as much as digits as its factorization.

20695457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76638.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 20695457 is about 4549.2259781198. The cubic root of 20695457 is about 274.5522498893.

The spelling of 20695457 in words is "twenty million, six hundred ninety-five thousand, four hundred fifty-seven".