20893745 has 4 divisors (see below), whose sum is σ = 25072500. Its totient is φ = 16714992.

The previous prime is 20893739. The next prime is 20893753. The reversal of 20893745 is 54739802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16128256 + 4765489 = 4016^2 + 2183^2 .

It is a cyclic number.

It is not a de Polignac number, because 20893745 - 2⁸ = 20893489 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20893699 and 20893708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089370 + ... + 2089379.

It is an arithmetic number, because the mean of its divisors is an integer number (6268125).

Almost surely, 2^20893745 is an apocalyptic number.

It is an amenable number.

20893745 is a deficient number, since it is larger than the sum of its proper divisors (4178755).

20893745 is an equidigital number, since it uses as much as digits as its factorization.

20893745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178754.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20893745 is about 4570.9676218499. The cubic root of 20893745 is about 275.4263139793.

The spelling of 20893745 in words is "twenty million, eight hundred ninety-three thousand, seven hundred forty-five".