20137811 has 8 divisors (see below), whose sum is σ = 21281280. Its totient is φ = 19016712.

The previous prime is 20137787. The next prime is 20137823. The reversal of 20137811 is 11873102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20137811 - 2¹⁴ = 20121427 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20137111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3725 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (2660160).

Almost surely, 2^20137811 is an apocalyptic number.

20137811 is a deficient number, since it is larger than the sum of its proper divisors (1143469).

20137811 is a wasteful number, since it uses less digits than its factorization.

20137811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11185.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 20137811 is about 4487.5172423067. The cubic root of 20137811 is about 272.0637961301.

The spelling of 20137811 in words is "twenty million, one hundred thirty-seven thousand, eight hundred eleven".