20551434 has 16 divisors (see below), whose sum is σ = 41313888. Its totient is φ = 6815312.

The previous prime is 20551417. The next prime is 20551441. The reversal of 20551434 is 43415502.

It is a super-2 number, since 2×20551434² = 844722878912712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7512 + ... + 9875.

It is an arithmetic number, because the mean of its divisors is an integer number (2582118).

Almost surely, 2^20551434 is an apocalyptic number.

20551434 is an abundant number, since it is smaller than the sum of its proper divisors (20762454).

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

20551434 is a wasteful number, since it uses less digits than its factorization.

20551434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17589.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20551434 is about 4533.3689459386. The cubic root of 20551434 is about 273.9138823969.

Adding to 20551434 its reverse (43415502), we get a palindrome (63966936).

The spelling of 20551434 in words is "twenty million, five hundred fifty-one thousand, four hundred thirty-four".