20280894 has 32 divisors (see below), whose sum is σ = 42557184. Its totient is φ = 6431040.

The previous prime is 20280893. The next prime is 20280899. The reversal of 20280894 is 49808202.

20280894 = 733² + 734² + ... + 768².

It is a super-2 number, since 2×20280894² = 822629322878472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38517 + ... + 39039.

It is an arithmetic number, because the mean of its divisors is an integer number (1329912).

Almost surely, 2^20280894 is an apocalyptic number.

20280894 is an abundant number, since it is smaller than the sum of its proper divisors (22276290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20280894 is a wasteful number, since it uses less digits than its factorization.

20280894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20280894 is about 4503.4313584199. The cubic root of 20280894 is about 272.7066311448.

The spelling of 20280894 in words is "twenty million, two hundred eighty thousand, eight hundred ninety-four".