20705070 has 32 divisors (see below), whose sum is σ = 49812480. Its totient is φ = 5508000.

The previous prime is 20705053. The next prime is 20705071. The reversal of 20705070 is 7050702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20705071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22071 + ... + 22989.

It is an arithmetic number, because the mean of its divisors is an integer number (1556640).

Almost surely, 2^20705070 is an apocalyptic number.

20705070 is an abundant number, since it is smaller than the sum of its proper divisors (29107410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20705070 is a wasteful number, since it uses less digits than its factorization.

20705070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

The product of its (nonzero) digits is 490, while the sum is 21.

The square root of 20705070 is about 4550.2824088182. The cubic root of 20705070 is about 274.5947529732.

Adding to 20705070 its reverse (7050702), we get a palindrome (27755772).

It can be divided in two parts, 2070 and 5070, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 20705070 in words is "twenty million, seven hundred five thousand, seventy".