20431611 has 6 divisors (see below), whose sum is σ = 29512340. Its totient is φ = 13621068.

The previous prime is 20431591. The next prime is 20431627. The reversal of 20431611 is 11613402.

It is a happy number.

20431611 is a `hidden beast` number, since 20 + 4 + 31 + 611 = 666.

It is not a de Polignac number, because 20431611 - 2⁶ = 20431547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135081 + ... + 1135098.

Almost surely, 2^20431611 is an apocalyptic number.

20431611 is a deficient number, since it is larger than the sum of its proper divisors (9080729).

20431611 is a wasteful number, since it uses less digits than its factorization.

20431611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270185 (or 2270182 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20431611 is about 4520.1339581919. The cubic root of 20431611 is about 273.3805023031.

The spelling of 20431611 in words is "twenty million, four hundred thirty-one thousand, six hundred eleven".