20287346 has 4 divisors (see below), whose sum is σ = 30431022. Its totient is φ = 10143672.

The previous prime is 20287343. The next prime is 20287363. The reversal of 20287346 is 64378202.

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

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 2436721 = 4225^2 + 1561^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20287343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5071835 + ... + 5071838.

Almost surely, 2^20287346 is an apocalyptic number.

20287346 is a deficient number, since it is larger than the sum of its proper divisors (10143676).

20287346 is a wasteful number, since it uses less digits than its factorization.

20287346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10143675.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20287346 is about 4504.1476441165. The cubic root of 20287346 is about 272.7355469746.

The spelling of 20287346 in words is "twenty million, two hundred eighty-seven thousand, three hundred forty-six".