20422020 has 48 divisors (see below), whose sum is σ = 57734208. Its totient is φ = 5393280.

The previous prime is 20422001. The next prime is 20422021. The reversal of 20422020 is 2022402.

It is a happy number.

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 = 20421987 and 20422005.

It is not an unprimeable number, because it can be changed into a prime (20422021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4830 + ... + 8010.

It is an arithmetic number, because the mean of its divisors is an integer number (1202796).

Almost surely, 2^20422020 is an apocalyptic number.

20422020 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 20422020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28867104).

20422020 is an abundant number, since it is smaller than the sum of its proper divisors (37312188).

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

20422020 is a wasteful number, since it uses less digits than its factorization.

20422020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300 (or 3298 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20422020 is about 4519.0729137734. The cubic root of 20422020 is about 273.3377188800.

Adding to 20422020 its reverse (2022402), we get a palindrome (22444422).

The spelling of 20422020 in words is "twenty million, four hundred twenty-two thousand, twenty".