20061911 has 4 divisors (see below), whose sum is σ = 20934192. Its totient is φ = 19189632.

The previous prime is 20061901. The next prime is 20061917. The reversal of 20061911 is 11916002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20061911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20061917) 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, 436106 + ... + 436151.

It is an arithmetic number, because the mean of its divisors is an integer number (5233548).

Almost surely, 2^20061911 is an apocalyptic number.

20061911 is a deficient number, since it is larger than the sum of its proper divisors (872281).

20061911 is an equidigital number, since it uses as much as digits as its factorization.

20061911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872280.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 20061911 is about 4479.0524667612. The cubic root of 20061911 is about 271.7215603293.

Adding to 20061911 its reverse (11916002), we get a palindrome (31977913).

The spelling of 20061911 in words is "twenty million, sixty-one thousand, nine hundred eleven".