20708711 has 4 divisors (see below), whose sum is σ = 20761272. Its totient is φ = 20656152.

The previous prime is 20708693. The next prime is 20708729. The reversal of 20708711 is 11780702.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20708693) and next prime (20708729).

It is a cyclic number.

It is not a de Polignac number, because 20708711 - 2¹⁴ = 20692327 is a prime.

It is a super-2 number, since 2×20708711² = 857701422563042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25685 + ... + 26478.

It is an arithmetic number, because the mean of its divisors is an integer number (5190318).

Almost surely, 2^20708711 is an apocalyptic number.

20708711 is a deficient number, since it is larger than the sum of its proper divisors (52561).

20708711 is an equidigital number, since it uses as much as digits as its factorization.

20708711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52560.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 20708711 is about 4550.6824762886. The cubic root of 20708711 is about 274.6108479183.

The spelling of 20708711 in words is "twenty million, seven hundred eight thousand, seven hundred eleven".