20491222 has 16 divisors (see below), whose sum is σ = 32628960. Its totient is φ = 9618048.

The previous prime is 20491193. The next prime is 20491223. The reversal of 20491222 is 22219402.

It is a junction number, because it is equal to n+sod(n) for n = 20491193 and 20491202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20491223) 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, 24304 + ... + 25132.

It is an arithmetic number, because the mean of its divisors is an integer number (2039310).

Almost surely, 2^20491222 is an apocalyptic number.

20491222 is a deficient number, since it is larger than the sum of its proper divisors (12137738).

20491222 is a wasteful number, since it uses less digits than its factorization.

20491222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20491222 is about 4526.7230973409. The cubic root of 20491222 is about 273.6461146094.

The spelling of 20491222 in words is "twenty million, four hundred ninety-one thousand, two hundred twenty-two".