20990422 has 8 divisors (see below), whose sum is σ = 31508856. Its totient is φ = 10487472.

The previous prime is 20990399. The next prime is 20990423. The reversal of 20990422 is 22409902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20990423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (3938607).

Almost surely, 2^20990422 is an apocalyptic number.

20990422 is a deficient number, since it is larger than the sum of its proper divisors (10518434).

20990422 is a wasteful number, since it uses less digits than its factorization.

20990422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7742.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20990422 is about 4581.5305302923. The cubic root of 20990422 is about 275.8504668536.

It can be divided in two parts, 20990 and 422, that added together give a palindrome (21412).

The spelling of 20990422 in words is "twenty million, nine hundred ninety thousand, four hundred twenty-two".