20622890 has 8 divisors (see below), whose sum is σ = 37121220. Its totient is φ = 8249152.

The previous prime is 20622869. The next prime is 20622911. The reversal of 20622890 is 9822602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20622869) and next prime (20622911).

It can be written as a sum of positive squares in 2 ways, for example, as 20620681 + 2209 = 4541^2 + 47^2 .

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

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1031135 + ... + 1031154.

Almost surely, 2^20622890 is an apocalyptic number.

20622890 is a deficient number, since it is larger than the sum of its proper divisors (16498330).

20622890 is a wasteful number, since it uses less digits than its factorization.

20622890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062296.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20622890 is about 4541.2432218502. The cubic root of 20622890 is about 274.2309754305.

It can be divided in two parts, 20622 and 890, that added together give a palindrome (21512).

The spelling of 20622890 in words is "twenty million, six hundred twenty-two thousand, eight hundred ninety".