20422420 has 24 divisors (see below), whose sum is σ = 43886304. Its totient is φ = 7978656.

The previous prime is 20422357. The next prime is 20422421. The reversal of 20422420 is 2422402.

20422420 = 51² + 52² + ... + 394².

It is a junction number, because it is equal to n+sod(n) for n = 20422394 and 20422403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422421) 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, 11014 + ... + 12733.

It is an arithmetic number, because the mean of its divisors is an integer number (1828596).

It is a self-describing number.

Almost surely, 2^20422420 is an apocalyptic number.

20422420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20422420 is an abundant number, since it is smaller than the sum of its proper divisors (23463884).

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

20422420 is a wasteful number, since it uses less digits than its factorization.

20422420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23799 (or 23797 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20422420 is about 4519.1171704217. The cubic root of 20422420 is about 273.3395034631.

Adding to 20422420 its reverse (2422402), we get a palindrome (22844822).

The spelling of 20422420 in words is "twenty million, four hundred twenty-two thousand, four hundred twenty".