20221020 has 36 divisors (see below), whose sum is σ = 61337640. Its totient is φ = 5392224.

The previous prime is 20221009. The next prime is 20221027. The reversal of 20221020 is 2012202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20220993 and 20221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55990 + ... + 56349.

Almost surely, 2^20221020 is an apocalyptic number.

20221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20221020 is an abundant number, since it is smaller than the sum of its proper divisors (41116620).

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

20221020 is a wasteful number, since it uses less digits than its factorization.

20221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112354 (or 112349 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20221020 is about 4496.7788471305. The cubic root of 20221020 is about 272.4380017752.

Adding to 20221020 its reverse (2012202), we get a palindrome (22233222).

The spelling of 20221020 in words is "twenty million, two hundred twenty-one thousand, twenty".