20488993 has 8 divisors (see below), whose sum is σ = 24223680. Its totient is φ = 16956240.

The previous prime is 20488943. The next prime is 20488997. The reversal of 20488993 is 39988402.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-20488993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20488997) 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, 50263 + ... + 50668.

It is an arithmetic number, because the mean of its divisors is an integer number (3027960).

Almost surely, 2^20488993 is an apocalyptic number.

It is an amenable number.

20488993 is a deficient number, since it is larger than the sum of its proper divisors (3734687).

20488993 is a wasteful number, since it uses less digits than its factorization.

20488993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100967.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 20488993 is about 4526.4768860561. The cubic root of 20488993 is about 273.6361919979.

The spelling of 20488993 in words is "twenty million, four hundred eighty-eight thousand, nine hundred ninety-three".