20488637 has 4 divisors (see below), whose sum is σ = 22064700. Its totient is φ = 18912576.

The previous prime is 20488627. The next prime is 20488649. The reversal of 20488637 is 73688402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13697401 + 6791236 = 3701^2 + 2606^2 .

It is a cyclic number.

It is not a de Polignac number, because 20488637 - 2¹⁰ = 20487613 is a prime.

It is a super-2 number, since 2×20488637² = 839568492235538, which contains 22 as substring.

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 20488637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20488627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788012 + ... + 788037.

It is an arithmetic number, because the mean of its divisors is an integer number (5516175).

Almost surely, 2^20488637 is an apocalyptic number.

It is an amenable number.

20488637 is a deficient number, since it is larger than the sum of its proper divisors (1576063).

20488637 is a wasteful number, since it uses less digits than its factorization.

20488637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576062.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20488637 is about 4526.4375617035. The cubic root of 20488637 is about 273.6346071624.

The spelling of 20488637 in words is "twenty million, four hundred eighty-eight thousand, six hundred thirty-seven".