20280844 has 12 divisors (see below), whose sum is σ = 35523544. Its totient is φ = 10131264.

The previous prime is 20280839. The next prime is 20280859. The reversal of 20280844 is 44808202.

It is a super-2 number, since 2×20280844² = 822625266704672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6139 + ... + 8845.

Almost surely, 2^20280844 is an apocalyptic number.

It is an amenable number.

20280844 is a deficient number, since it is larger than the sum of its proper divisors (15242700).

20280844 is a wasteful number, since it uses less digits than its factorization.

20280844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584 (or 4582 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 20280844 is about 4503.4258070940. The cubic root of 20280844 is about 272.7064070367.

The spelling of 20280844 in words is "twenty million, two hundred eighty thousand, eight hundred forty-four".