20663527 has 4 divisors (see below), whose sum is σ = 20768616. Its totient is φ = 20558440.

The previous prime is 20663509. The next prime is 20663543. The reversal of 20663527 is 72536602.

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 20663527 - 2¹⁹ = 20139239 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 (20663557) 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, 52249 + ... + 52642.

It is an arithmetic number, because the mean of its divisors is an integer number (5192154).

Almost surely, 2^20663527 is an apocalyptic number.

20663527 is a deficient number, since it is larger than the sum of its proper divisors (105089).

20663527 is a wasteful number, since it uses less digits than its factorization.

20663527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105088.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 20663527 is about 4545.7152352518. The cubic root of 20663527 is about 274.4109795024.

The spelling of 20663527 in words is "twenty million, six hundred sixty-three thousand, five hundred twenty-seven".