20749785 has 64 divisors (see below), whose sum is σ = 40128000. Its totient is φ = 9144576.

The previous prime is 20749777. The next prime is 20749787. The reversal of 20749785 is 58794702.

It is not a de Polignac number, because 20749785 - 2³ = 20749777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20749787) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 190311 + ... + 190419.

It is an arithmetic number, because the mean of its divisors is an integer number (627000).

Almost surely, 2^20749785 is an apocalyptic number.

It is an amenable number.

20749785 is a deficient number, since it is larger than the sum of its proper divisors (19378215).

20749785 is a wasteful number, since it uses less digits than its factorization.

20749785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 20749785 is about 4555.1931901951. The cubic root of 20749785 is about 274.7922839164.

The spelling of 20749785 in words is "twenty million, seven hundred forty-nine thousand, seven hundred eighty-five".