20229690 has 32 divisors (see below), whose sum is σ = 52286976. Its totient is φ = 4979520.

The previous prime is 20229667. The next prime is 20229709. The reversal of 20229690 is 9692202.

It is a super-2 number, since 2×20229690² = 818480714992200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25546 + ... + 26325.

It is an arithmetic number, because the mean of its divisors is an integer number (1633968).

Almost surely, 2^20229690 is an apocalyptic number.

20229690 is an abundant number, since it is smaller than the sum of its proper divisors (32057286).

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

20229690 is a wasteful number, since it uses less digits than its factorization.

20229690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51894.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20229690 is about 4497.7427672111. The cubic root of 20229690 is about 272.4769332101.

It can be divided in two parts, 202 and 29690, that added together give a palindrome (29892).

The spelling of 20229690 in words is "twenty million, two hundred twenty-nine thousand, six hundred ninety".