20211090 has 32 divisors (see below), whose sum is σ = 48625920. Its totient is φ = 5376384.

The previous prime is 20211077. The next prime is 20211097. The reversal of 20211090 is 9011202.

It is a happy number.

20211090 is nontrivially palindromic in base 12.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20211097) 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 15 ways as a sum of consecutive naturals, for example, 21102 + ... + 22038.

It is an arithmetic number, because the mean of its divisors is an integer number (1519560).

Almost surely, 2^20211090 is an apocalyptic number.

20211090 is an abundant number, since it is smaller than the sum of its proper divisors (28414830).

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

20211090 is a wasteful number, since it uses less digits than its factorization.

20211090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20211090 is about 4495.6745878678. The cubic root of 20211090 is about 272.3933988106.

Adding to 20211090 its reverse (9011202), we get a palindrome (29222292).

The spelling of 20211090 in words is "twenty million, two hundred eleven thousand, ninety".