20894397 has 4 divisors (see below), whose sum is σ = 27859200. Its totient is φ = 13929596.

The previous prime is 20894389. The next prime is 20894399. The reversal of 20894397 is 79349802.

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 20894397 - 2³ = 20894389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20894399) 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, 3482397 + ... + 3482402.

It is an arithmetic number, because the mean of its divisors is an integer number (6964800).

Almost surely, 2^20894397 is an apocalyptic number.

It is an amenable number.

20894397 is a deficient number, since it is larger than the sum of its proper divisors (6964803).

20894397 is an equidigital number, since it uses as much as digits as its factorization.

20894397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6964802.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20894397 is about 4571.0389409849. The cubic root of 20894397 is about 275.4291788891.

The spelling of 20894397 in words is "twenty million, eight hundred ninety-four thousand, three hundred ninety-seven".