20533672 has 8 divisors (see below), whose sum is σ = 38500650. Its totient is φ = 10266832.

The previous prime is 20533663. The next prime is 20533679. The reversal of 20533672 is 27633502.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 695556 = 4454^2 + 834^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20533672.

It is not an unprimeable number, because it can be changed into a prime (20533679) by changing a digit.

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 as a sum of consecutive naturals, namely, 1283347 + ... + 1283362.

Almost surely, 2^20533672 is an apocalyptic number.

It is an amenable number.

20533672 is a deficient number, since it is larger than the sum of its proper divisors (17966978).

20533672 is a wasteful number, since it uses less digits than its factorization.

20533672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566715 (or 2566711 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 20533672 is about 4531.4094937447. The cubic root of 20533672 is about 273.8349477479.

The spelling of 20533672 in words is "twenty million, five hundred thirty-three thousand, six hundred seventy-two".