20221770 has 16 divisors (see below), whose sum is σ = 48532320. Its totient is φ = 5392464.

The previous prime is 20221763. The next prime is 20221781. The reversal of 20221770 is 7712202.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337000 + ... + 337059.

It is an arithmetic number, because the mean of its divisors is an integer number (3033270).

Almost surely, 2^20221770 is an apocalyptic number.

20221770 is an abundant number, since it is smaller than the sum of its proper divisors (28310550).

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

20221770 is a wasteful number, since it uses less digits than its factorization.

20221770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674069.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 20221770 is about 4496.8622393843. The cubic root of 20221770 is about 272.4413699860.

Adding to 20221770 its reverse (7712202), we get a palindrome (27933972).

The spelling of 20221770 in words is "twenty million, two hundred twenty-one thousand, seven hundred seventy".