20988263 has 8 divisors (see below), whose sum is σ = 21263040. Its totient is φ = 20715520.

The previous prime is 20988221. The next prime is 20988299. The reversal of 20988263 is 36288902.

It is a happy number.

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 20988263 - 2⁸ = 20988007 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 (20988203) 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, 32423 + ... + 33063.

It is an arithmetic number, because the mean of its divisors is an integer number (2657880).

Almost surely, 2^20988263 is an apocalyptic number.

20988263 is a deficient number, since it is larger than the sum of its proper divisors (274777).

20988263 is a wasteful number, since it uses less digits than its factorization.

20988263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 20988263 is about 4581.2949042820. The cubic root of 20988263 is about 275.8410088641.

The spelling of 20988263 in words is "twenty million, nine hundred eighty-eight thousand, two hundred sixty-three".