20143420 has 96 divisors (see below), whose sum is σ = 49996800. Its totient is φ = 6739200.

The previous prime is 20143411. The next prime is 20143421. The reversal of 20143420 is 2434102.

It is a junction number, because it is equal to n+sod(n) for n = 20143394 and 20143403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254941 + ... + 255019.

It is an arithmetic number, because the mean of its divisors is an integer number (520800).

Almost surely, 2^20143420 is an apocalyptic number.

20143420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20143420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24998400).

20143420 is an abundant number, since it is smaller than the sum of its proper divisors (29853380).

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

20143420 is a wasteful number, since it uses less digits than its factorization.

20143420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20143420 is about 4488.1421546114. The cubic root of 20143420 is about 272.0890531648.

Adding to 20143420 its reverse (2434102), we get a palindrome (22577522).

The spelling of 20143420 in words is "twenty million, one hundred forty-three thousand, four hundred twenty".