20520311 has 8 divisors (see below), whose sum is σ = 24085920. Its totient is φ = 17113248.

The previous prime is 20520307. The next prime is 20520317. The reversal of 20520311 is 11302502.

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 20520311 - 2² = 20520307 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 (20520317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39356 + ... + 39873.

It is an arithmetic number, because the mean of its divisors is an integer number (3010740).

Almost surely, 2^20520311 is an apocalyptic number.

20520311 is a deficient number, since it is larger than the sum of its proper divisors (3565609).

20520311 is an equidigital number, since it uses as much as digits as its factorization.

20520311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79273.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20520311 is about 4529.9349884960. The cubic root of 20520311 is about 273.7755412183.

Adding to 20520311 its reverse (11302502), we get a palindrome (31822813).

The spelling of 20520311 in words is "twenty million, five hundred twenty thousand, three hundred eleven".