20020311 has 8 divisors (see below), whose sum is σ = 29659760. Its totient is φ = 13346856.

The previous prime is 20020307. The next prime is 20020331. The reversal of 20020311 is 11302002.

It is a happy number.

It is not a de Polignac number, because 20020311 - 2² = 20020307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020293 and 20020302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020331) 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, 370720 + ... + 370773.

It is an arithmetic number, because the mean of its divisors is an integer number (3707470).

Almost surely, 2^20020311 is an apocalyptic number.

20020311 is a deficient number, since it is larger than the sum of its proper divisors (9639449).

20020311 is an equidigital number, since it uses as much as digits as its factorization.

20020311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741502 (or 741496 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20020311 is about 4474.4062175891. The cubic root of 20020311 is about 271.5336181319.

Adding to 20020311 its reverse (11302002), we get a palindrome (31322313).

The spelling of 20020311 in words is "twenty million, twenty thousand, three hundred eleven".