20187007 has 4 divisors (see below), whose sum is σ = 21374496. Its totient is φ = 18999520.

The previous prime is 20186993. The next prime is 20187023. The reversal of 20187007 is 70078102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20187007 - 2⁷ = 20186879 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 (20187707) 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, 593719 + ... + 593752.

It is an arithmetic number, because the mean of its divisors is an integer number (5343624).

Almost surely, 2^20187007 is an apocalyptic number.

20187007 is a deficient number, since it is larger than the sum of its proper divisors (1187489).

20187007 is a wasteful number, since it uses less digits than its factorization.

20187007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187488.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 20187007 is about 4492.9953260603. The cubic root of 20187007 is about 272.2851635539.

It can be divided in two parts, 2018 and 7007, that added together give a square (9025 = 95²).

The spelling of 20187007 in words is "twenty million, one hundred eighty-seven thousand, seven".