20011329 has 24 divisors (see below), whose sum is σ = 32963112. Its totient is φ = 11589120.

The previous prime is 20011319. The next prime is 20011349. The reversal of 20011329 is 92311002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2772225 + 17239104 = 1665^2 + 4152^2 .

It is not a de Polignac number, because 20011329 - 2¹⁵ = 19978561 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3042 + ... + 7019.

It is an arithmetic number, because the mean of its divisors is an integer number (1373463).

Almost surely, 2^20011329 is an apocalyptic number.

It is an amenable number.

20011329 is a deficient number, since it is larger than the sum of its proper divisors (12951783).

20011329 is a wasteful number, since it uses less digits than its factorization.

20011329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10097 (or 10094 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 20011329 is about 4473.4023963869. The cubic root of 20011329 is about 271.4930047138.

The spelling of 20011329 in words is "twenty million, eleven thousand, three hundred twenty-nine".