20822646 has 16 divisors (see below), whose sum is σ = 44848944. Its totient is φ = 6406944.

The previous prime is 20822591. The next prime is 20822647. The reversal of 20822646 is 64622802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20822647) 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, 133401 + ... + 133556.

It is an arithmetic number, because the mean of its divisors is an integer number (2803059).

Almost surely, 2^20822646 is an apocalyptic number.

20822646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20822646 is an abundant number, since it is smaller than the sum of its proper divisors (24026298).

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

20822646 is a wasteful number, since it uses less digits than its factorization.

20822646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266975.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 20822646 is about 4563.1837569837. The cubic root of 20822646 is about 275.1135442970.

The spelling of 20822646 in words is "twenty million, eight hundred twenty-two thousand, six hundred forty-six".