20811411 has 10 divisors (see below), whose sum is σ = 31088772. Its totient is φ = 13874220.

The previous prime is 20811409. The next prime is 20811419. The reversal of 20811411 is 11411802.

It is not a de Polignac number, because 20811411 - 2¹ = 20811409 is a prime.

It is a super-2 number, since 2×20811411² = 866229655621842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20811419) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 128385 + ... + 128546.

Almost surely, 2^20811411 is an apocalyptic number.

20811411 is a deficient number, since it is larger than the sum of its proper divisors (10277361).

20811411 is an equidigital number, since it uses as much as digits as its factorization.

20811411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256943 (or 256934 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 20811411 is about 4561.9525424976. The cubic root of 20811411 is about 275.0640556018.

The spelling of 20811411 in words is "twenty million, eight hundred eleven thousand, four hundred eleven".