20288907 has 16 divisors (see below), whose sum is σ = 30138880. Its totient is φ = 13489416.

The previous prime is 20288899. The next prime is 20288909. The reversal of 20288907 is 70988202.

It is not a de Polignac number, because 20288907 - 2³ = 20288899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12378 + ... + 13920.

It is an arithmetic number, because the mean of its divisors is an integer number (1883680).

Almost surely, 2^20288907 is an apocalyptic number.

20288907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20288907 is a deficient number, since it is larger than the sum of its proper divisors (9849973).

20288907 is a wasteful number, since it uses less digits than its factorization.

20288907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039 (or 2033 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20288907 is about 4504.3209255114. The cubic root of 20288907 is about 272.7425419633.

The spelling of 20288907 in words is "twenty million, two hundred eighty-eight thousand, nine hundred seven".