20998463 has 8 divisors (see below), whose sum is σ = 21520800. Its totient is φ = 20482560.

The previous prime is 20998459. The next prime is 20998489. The reversal of 20998463 is 36489902.

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 20998463 - 2² = 20998459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20998463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998433) 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, 5363 + ... + 8411.

It is an arithmetic number, because the mean of its divisors is an integer number (2690100).

Almost surely, 2^20998463 is an apocalyptic number.

20998463 is a deficient number, since it is larger than the sum of its proper divisors (522337).

20998463 is an equidigital number, since it uses as much as digits as its factorization.

20998463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20998463 is about 4582.4079914386. The cubic root of 20998463 is about 275.8856865748.

The spelling of 20998463 in words is "twenty million, nine hundred ninety-eight thousand, four hundred sixty-three".