20527987 has 4 divisors (see below), whose sum is σ = 20545920. Its totient is φ = 20510056.

The previous prime is 20527981. The next prime is 20528023. The reversal of 20527987 is 78972502.

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 20527987 - 2¹⁹ = 20003699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20527981) 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, 7123 + ... + 9580.

It is an arithmetic number, because the mean of its divisors is an integer number (5136480).

Almost surely, 2^20527987 is an apocalyptic number.

20527987 is a deficient number, since it is larger than the sum of its proper divisors (17933).

20527987 is a wasteful number, since it uses less digits than its factorization.

20527987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17932.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 20527987 is about 4530.7821620555. The cubic root of 20527987 is about 273.8096738893.

The spelling of 20527987 in words is "twenty million, five hundred twenty-seven thousand, nine hundred eighty-seven".