20710261 has 16 divisors (see below), whose sum is σ = 24470208. Its totient is φ = 17280000.

The previous prime is 20710259. The next prime is 20710273. The reversal of 20710261 is 16201702.

It is a 5-Lehmer number, since φ(20710261) divides (20710261-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 20710261 - 2¹ = 20710259 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 (20710231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35605 + ... + 36181.

It is an arithmetic number, because the mean of its divisors is an integer number (1529388).

Almost surely, 2^20710261 is an apocalyptic number.

It is an amenable number.

20710261 is a deficient number, since it is larger than the sum of its proper divisors (3759947).

20710261 is a wasteful number, since it uses less digits than its factorization.

20710261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20710261 is about 4550.8527772276. The cubic root of 20710261 is about 274.6176990802.

Adding to 20710261 its reverse (16201702), we get a palindrome (36911963).

The spelling of 20710261 in words is "twenty million, seven hundred ten thousand, two hundred sixty-one".