20487356 has 6 divisors (see below), whose sum is σ = 35852880. Its totient is φ = 10243676.

The previous prime is 20487343. The next prime is 20487359. The reversal of 20487356 is 65378402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487359) 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 as a sum of consecutive naturals, namely, 2560916 + ... + 2560923.

It is an arithmetic number, because the mean of its divisors is an integer number (5975480).

Almost surely, 2^20487356 is an apocalyptic number.

It is an amenable number.

20487356 is a deficient number, since it is larger than the sum of its proper divisors (15365524).

20487356 is a wasteful number, since it uses less digits than its factorization.

20487356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121843 (or 5121841 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20487356 is about 4526.2960574845. The cubic root of 20487356 is about 273.6289042739.

The spelling of 20487356 in words is "twenty million, four hundred eighty-seven thousand, three hundred fifty-six".