20280238 has 16 divisors (see below), whose sum is σ = 33813936. Its totient is φ = 9043840.

The previous prime is 20280229. The next prime is 20280259. The reversal of 20280238 is 83208202.

It is a super-2 number, since 2×20280238² = 822576106673288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7531 + ... + 9862.

It is an arithmetic number, because the mean of its divisors is an integer number (2113371).

Almost surely, 2^20280238 is an apocalyptic number.

20280238 is a deficient number, since it is larger than the sum of its proper divisors (13533698).

20280238 is a wasteful number, since it uses less digits than its factorization.

20280238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17459.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20280238 is about 4503.3585244793. The cubic root of 20280238 is about 272.7036908162.

The spelling of 20280238 in words is "twenty million, two hundred eighty thousand, two hundred thirty-eight".