20887007 has 4 divisors (see below), whose sum is σ = 20934600. Its totient is φ = 20839416.

The previous prime is 20887001. The next prime is 20887019. The reversal of 20887007 is 70078802.

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 20887007 - 2⁴ = 20886991 is a prime.

It is a super-2 number, since 2×20887007² = 872534122836098, 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 (20887001) 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, 23132 + ... + 24017.

It is an arithmetic number, because the mean of its divisors is an integer number (5233650).

Almost surely, 2^20887007 is an apocalyptic number.

20887007 is a deficient number, since it is larger than the sum of its proper divisors (47593).

20887007 is an equidigital number, since it uses as much as digits as its factorization.

20887007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47592.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 20887007 is about 4570.2305193502. The cubic root of 20887007 is about 275.3967034900.

The spelling of 20887007 in words is "twenty million, eight hundred eighty-seven thousand, seven".