20887246 has 4 divisors (see below), whose sum is σ = 31330872. Its totient is φ = 10443622.

The previous prime is 20887231. The next prime is 20887249. The reversal of 20887246 is 64278802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5221810 + ... + 5221813.

It is an arithmetic number, because the mean of its divisors is an integer number (7832718).

Almost surely, 2^20887246 is an apocalyptic number.

20887246 is a deficient number, since it is larger than the sum of its proper divisors (10443626).

20887246 is a wasteful number, since it uses less digits than its factorization.

20887246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10443625.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 20887246 is about 4570.2566667530. The cubic root of 20887246 is about 275.3977538968.

The spelling of 20887246 in words is "twenty million, eight hundred eighty-seven thousand, two hundred forty-six".