20581434 has 24 divisors (see below), whose sum is σ = 45631872. Its totient is φ = 6700680.

The previous prime is 20581417. The next prime is 20581469. The reversal of 20581434 is 43418502.

It is a junction number, because it is equal to n+sod(n) for n = 20581398 and 20581407.

It is an unprimeable number.

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, 12522 + ... + 14069.

It is an arithmetic number, because the mean of its divisors is an integer number (1901328).

Almost surely, 2^20581434 is an apocalyptic number.

20581434 is an abundant number, since it is smaller than the sum of its proper divisors (25050438).

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

20581434 is a wasteful number, since it uses less digits than its factorization.

20581434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26642 (or 26639 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20581434 is about 4536.6765368494. The cubic root of 20581434 is about 274.0470997229.

Adding to 20581434 its reverse (43418502), we get a palindrome (63999936).

The spelling of 20581434 in words is "twenty million, five hundred eighty-one thousand, four hundred thirty-four".