20380711 has 16 divisors (see below), whose sum is σ = 23346400. Its totient is φ = 17635968.

The previous prime is 20380699. The next prime is 20380721. The reversal of 20380711 is 11708302.

It is a 9-Lehmer number, since φ(20380711) divides (20380711-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 20380711 - 2¹¹ = 20378663 is a prime.

It is the 4515-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20380721) by changing a digit.

It is a nontrivial repunit in base 4514.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26545 + ... + 27301.

It is an arithmetic number, because the mean of its divisors is an integer number (1459150).

Almost surely, 2^20380711 is an apocalyptic number.

20380711 is a deficient number, since it is larger than the sum of its proper divisors (2965689).

20380711 is a wasteful number, since it uses less digits than its factorization.

20380711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 20380711 is about 4514.5000830657. The cubic root of 20380711 is about 273.1532949163.

The spelling of 20380711 in words is "twenty million, three hundred eighty thousand, seven hundred eleven".