20912434 has 4 divisors (see below), whose sum is σ = 31368654. Its totient is φ = 10456216.

The previous prime is 20912417. The next prime is 20912453. The reversal of 20912434 is 43421902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43421902 = 2 ⋅21710951.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 3814209 = 4135^2 + 1953^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20912399 and 20912408.

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 as a sum of consecutive naturals, namely, 5228107 + ... + 5228110.

Almost surely, 2^20912434 is an apocalyptic number.

20912434 is a deficient number, since it is larger than the sum of its proper divisors (10456220).

20912434 is a wasteful number, since it uses less digits than its factorization.

20912434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10456219.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20912434 is about 4573.0114804142. The cubic root of 20912434 is about 275.5084104534.

The spelling of 20912434 in words is "twenty million, nine hundred twelve thousand, four hundred thirty-four".