20405022 has 16 divisors (see below), whose sum is σ = 44520192. Its totient is φ = 6183320.

The previous prime is 20404999. The next prime is 20405027. The reversal of 20405022 is 22050402.

It is a junction number, because it is equal to n+sod(n) for n = 20404992 and 20405010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405027) 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, 154518 + ... + 154649.

It is an arithmetic number, because the mean of its divisors is an integer number (2782512).

Almost surely, 2^20405022 is an apocalyptic number.

20405022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20405022 is an abundant number, since it is smaller than the sum of its proper divisors (24115170).

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

20405022 is a wasteful number, since it uses less digits than its factorization.

20405022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309183.

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20405022 is about 4517.1918267880. The cubic root of 20405022 is about 273.2618614769.

Adding to 20405022 its reverse (22050402), we get a palindrome (42455424).

The spelling of 20405022 in words is "twenty million, four hundred five thousand, twenty-two".