20785479 has 24 divisors (see below), whose sum is σ = 32746752. Its totient is φ = 11625120.

The previous prime is 20785447. The next prime is 20785493. The reversal of 20785479 is 97458702.

It is not a de Polignac number, because 20785479 - 2⁵ = 20785447 is a prime.

It is a super-2 number, since 2×20785479² = 864072274518882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20785479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785409) 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 23 ways as a sum of consecutive naturals, for example, 3714 + ... + 7440.

It is an arithmetic number, because the mean of its divisors is an integer number (1364448).

Almost surely, 2^20785479 is an apocalyptic number.

20785479 is a deficient number, since it is larger than the sum of its proper divisors (11961273).

20785479 is a wasteful number, since it uses less digits than its factorization.

20785479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3767 (or 3754 counting only the distinct ones).

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

The square root of 20785479 is about 4559.1094525137. The cubic root of 20785479 is about 274.9497605193.

It can be divided in two parts, 2078 and 5479, that added together give a palindrome (7557).

The spelling of 20785479 in words is "twenty million, seven hundred eighty-five thousand, four hundred seventy-nine".