20187245 has 16 divisors (see below), whose sum is σ = 27624240. Its totient is φ = 14029824.

The previous prime is 20187229. The next prime is 20187259. The reversal of 20187245 is 54278102.

It can be written as a sum of positive squares in 8 ways, for example, as 196 + 20187049 = 14^2 + 4493^2 .

It is a cyclic number.

It is not a de Polignac number, because 20187245 - 2⁴ = 20187229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8030 + ... + 10239.

It is an arithmetic number, because the mean of its divisors is an integer number (1726515).

Almost surely, 2^20187245 is an apocalyptic number.

It is an amenable number.

20187245 is a deficient number, since it is larger than the sum of its proper divisors (7436995).

20187245 is a wasteful number, since it uses less digits than its factorization.

20187245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18304.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20187245 is about 4493.0218116542. The cubic root of 20187245 is about 272.2862336088.

The spelling of 20187245 in words is "twenty million, one hundred eighty-seven thousand, two hundred forty-five".