20287007 has 4 divisors (see below), whose sum is σ = 21847560. Its totient is φ = 18726456.

The previous prime is 20286977. The next prime is 20287039. The reversal of 20287007 is 70078202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70078202 = 2 ⋅35039101.

It is a cyclic number.

It is not a de Polignac number, because 20287007 - 2¹⁰ = 20285983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780257 + ... + 780282.

It is an arithmetic number, because the mean of its divisors is an integer number (5461890).

Almost surely, 2^20287007 is an apocalyptic number.

20287007 is a deficient number, since it is larger than the sum of its proper divisors (1560553).

20287007 is a wasteful number, since it uses less digits than its factorization.

20287007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560552.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20287007 is about 4504.1100119779. The cubic root of 20287007 is about 272.7340278361.

The spelling of 20287007 in words is "twenty million, two hundred eighty-seven thousand, seven".