20507434 has 8 divisors (see below), whose sum is σ = 30784608. Its totient is φ = 10245900.

The previous prime is 20507429. The next prime is 20507471. The reversal of 20507434 is 43470502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20507399 and 20507408.

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 3 ways as a sum of consecutive naturals, for example, 259 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (3848076).

Almost surely, 2^20507434 is an apocalyptic number.

20507434 is a deficient number, since it is larger than the sum of its proper divisors (10277174).

20507434 is a wasteful number, since it uses less digits than its factorization.

20507434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7820.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20507434 is about 4528.5134426211. The cubic root of 20507434 is about 273.7182622728.

Adding to 20507434 its reverse (43470502), we get a palindrome (63977936).

The spelling of 20507434 in words is "twenty million, five hundred seven thousand, four hundred thirty-four".