20487263 has 8 divisors (see below), whose sum is σ = 21870720. Its totient is φ = 19134360.

The previous prime is 20487251. The next prime is 20487289. The reversal of 20487263 is 36278402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20487263 - 2¹⁰ = 20486239 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 (20487163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6245 + ... + 8942.

It is an arithmetic number, because the mean of its divisors is an integer number (2733840).

Almost surely, 2^20487263 is an apocalyptic number.

20487263 is a deficient number, since it is larger than the sum of its proper divisors (1383457).

20487263 is a wasteful number, since it uses less digits than its factorization.

20487263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15277.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20487263 is about 4526.2857841723. The cubic root of 20487263 is about 273.6284902376.

The spelling of 20487263 in words is "twenty million, four hundred eighty-seven thousand, two hundred sixty-three".