20787485 has 8 divisors (see below), whose sum is σ = 25076736. Its totient is φ = 16542160.

The previous prime is 20787479. The next prime is 20787491. The reversal of 20787485 is 58478702.

It is an interprime number because it is at equal distance from previous prime (20787479) and next prime (20787491).

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

It is not a de Polignac number, because 20787485 - 2¹⁶ = 20721949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9929 + ... + 11838.

It is an arithmetic number, because the mean of its divisors is an integer number (3134592).

Almost surely, 2^20787485 is an apocalyptic number.

It is an amenable number.

20787485 is a deficient number, since it is larger than the sum of its proper divisors (4289251).

20787485 is a wasteful number, since it uses less digits than its factorization.

20787485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21963.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 20787485 is about 4559.3294463112. The cubic root of 20787485 is about 274.9586053396.

The spelling of 20787485 in words is "twenty million, seven hundred eighty-seven thousand, four hundred eighty-five".