20887245 has 24 divisors (see below), whose sum is σ = 37090872. Its totient is φ = 10867200.

The previous prime is 20887231. The next prime is 20887249. The reversal of 20887245 is 54278802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 933156 + 19954089 = 966^2 + 4467^2 .

It is not a de Polignac number, because 20887245 - 2¹⁰ = 20886221 is a prime.

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 in 23 ways as a sum of consecutive naturals, for example, 3816 + ... + 7505.

It is an arithmetic number, because the mean of its divisors is an integer number (1545453).

Almost surely, 2^20887245 is an apocalyptic number.

It is an amenable number.

20887245 is a deficient number, since it is larger than the sum of its proper divisors (16203627).

20887245 is a wasteful number, since it uses less digits than its factorization.

20887245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11373 (or 11370 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20887245 is about 4570.2565573499. The cubic root of 20887245 is about 275.3977495018.

The spelling of 20887245 in words is "twenty million, eight hundred eighty-seven thousand, two hundred forty-five".