20280207 has 8 divisors (see below), whose sum is σ = 27089920. Its totient is φ = 13495320.

The previous prime is 20280191. The next prime is 20280217. The reversal of 20280207 is 70208202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20280207 - 2⁴ = 20280191 is a prime.

It is a super-2 number, since 2×20280207² = 822573591925698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4207 + ... + 7632.

It is an arithmetic number, because the mean of its divisors is an integer number (3386240).

Almost surely, 2^20280207 is an apocalyptic number.

20280207 is a deficient number, since it is larger than the sum of its proper divisors (6809713).

20280207 is a wasteful number, since it uses less digits than its factorization.

20280207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12413.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20280207 is about 4503.3550826023. The cubic root of 20280207 is about 272.7035518662.

Adding to 20280207 its reverse (70208202), we get a palindrome (90488409).

The spelling of 20280207 in words is "twenty million, two hundred eighty thousand, two hundred seven".