20813070 has 32 divisors (see below), whose sum is σ = 50453280. Its totient is φ = 5494400.

The previous prime is 20813063. The next prime is 20813077. The reversal of 20813070 is 7031802.

It is an interprime number because it is at equal distance from previous prime (20813063) and next prime (20813077).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813077) 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, 405 + ... + 6464.

It is an arithmetic number, because the mean of its divisors is an integer number (1576665).

Almost surely, 2^20813070 is an apocalyptic number.

20813070 is an abundant number, since it is smaller than the sum of its proper divisors (29640210).

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

20813070 is a wasteful number, since it uses less digits than its factorization.

20813070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6980.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20813070 is about 4562.1343689111. The cubic root of 20813070 is about 275.0713643990.

Adding to 20813070 its reverse (7031802), we get a palindrome (27844872).

It can be divided in two parts, 2081 and 3070, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 20813070 in words is "twenty million, eight hundred thirteen thousand, seventy".