20748685 has 16 divisors (see below), whose sum is σ = 25460352. Its totient is φ = 16228800.

The previous prime is 20748683. The next prime is 20748701. The reversal of 20748685 is 58684702.

It is not a de Polignac number, because 20748685 - 2¹ = 20748683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20748683) 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 15 ways as a sum of consecutive naturals, for example, 74767 + ... + 75043.

It is an arithmetic number, because the mean of its divisors is an integer number (1591272).

Almost surely, 2^20748685 is an apocalyptic number.

It is an amenable number.

20748685 is a deficient number, since it is larger than the sum of its proper divisors (4711667).

20748685 is a wasteful number, since it uses less digits than its factorization.

20748685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 20748685 is about 4555.0724472834. The cubic root of 20748685 is about 274.7874280130.

The spelling of 20748685 in words is "twenty million, seven hundred forty-eight thousand, six hundred eighty-five".