20551234 has 32 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 9013200.

The previous prime is 20551231. The next prime is 20551241. The reversal of 20551234 is 43215502.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20551231) 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, 92047 + ... + 92269.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^20551234 is an apocalyptic number.

20551234 is a deficient number, since it is larger than the sum of its proper divisors (14285246).

20551234 is a wasteful number, since it uses less digits than its factorization.

20551234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20551234 is about 4533.3468872346. The cubic root of 20551234 is about 273.9129938465.

Adding to 20551234 its reverse (43215502), we get a palindrome (63766736).

The spelling of 20551234 in words is "twenty million, five hundred fifty-one thousand, two hundred thirty-four".