20516474 has 8 divisors (see below), whose sum is σ = 33572448. Its totient is φ = 9325660.

The previous prime is 20516473. The next prime is 20516519. The reversal of 20516474 is 47461502.

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

It is not an unprimeable number, because it can be changed into a prime (20516471) by changing a digit.

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, 466262 + ... + 466305.

It is an arithmetic number, because the mean of its divisors is an integer number (4196556).

Almost surely, 2^20516474 is an apocalyptic number.

20516474 is a deficient number, since it is larger than the sum of its proper divisors (13055974).

20516474 is a wasteful number, since it uses less digits than its factorization.

20516474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932580.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20516474 is about 4529.5114526845. The cubic root of 20516474 is about 273.7584761385.

Adding to 20516474 its reverse (47461502), we get a palindrome (67977976).

The spelling of 20516474 in words is "twenty million, five hundred sixteen thousand, four hundred seventy-four".