20211420 has 24 divisors (see below), whose sum is σ = 56592144. Its totient is φ = 5389696.

The previous prime is 20211407. The next prime is 20211461. The reversal of 20211420 is 2411202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20211396 and 20211405.

It is a congruent number.

It is an unprimeable number.

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, 168369 + ... + 168488.

It is an arithmetic number, because the mean of its divisors is an integer number (2358006).

Almost surely, 2^20211420 is an apocalyptic number.

20211420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211420 is an abundant number, since it is smaller than the sum of its proper divisors (36380724).

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

20211420 is a wasteful number, since it uses less digits than its factorization.

20211420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336869 (or 336867 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20211420 is about 4495.7112896626. The cubic root of 20211420 is about 272.3948813190.

Adding to 20211420 its reverse (2411202), we get a palindrome (22622622).

The spelling of 20211420 in words is "twenty million, two hundred eleven thousand, four hundred twenty".