20018907 has 20 divisors (see below), whose sum is σ = 30213216. Its totient is φ = 13208400.

The previous prime is 20018893. The next prime is 20018909. The reversal of 20018907 is 70981002.

It is not a de Polignac number, because 20018907 - 2⁴ = 20018891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20018909) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6958 + ... + 9404.

Almost surely, 2^20018907 is an apocalyptic number.

20018907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20018907 is a deficient number, since it is larger than the sum of its proper divisors (10194309).

20018907 is a wasteful number, since it uses less digits than its factorization.

20018907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560 (or 2551 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20018907 is about 4474.2493225121. The cubic root of 20018907 is about 271.5272705430.

Adding to 20018907 its reverse (70981002), we get a palindrome (90999909).

The spelling of 20018907 in words is "twenty million, eighteen thousand, nine hundred seven".