20311420 has 12 divisors (see below), whose sum is σ = 42654024. Its totient is φ = 8124560.

The previous prime is 20311381. The next prime is 20311433. The reversal of 20311420 is 2411302.

It is a self number, because there is not a number n which added to its sum of digits gives 20311420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507766 + ... + 507805.

It is an arithmetic number, because the mean of its divisors is an integer number (3554502).

Almost surely, 2^20311420 is an apocalyptic number.

20311420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311420 is an abundant number, since it is smaller than the sum of its proper divisors (22342604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311420 is a wasteful number, since it uses less digits than its factorization.

20311420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015580 (or 1015578 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20311420 is about 4506.8192774949. The cubic root of 20311420 is about 272.8433849696.

Adding to 20311420 its reverse (2411302), we get a palindrome (22722722).

The spelling of 20311420 in words is "twenty million, three hundred eleven thousand, four hundred twenty".