20511272 has 8 divisors (see below), whose sum is σ = 38458650. Its totient is φ = 10255632.

The previous prime is 20511251. The next prime is 20511289. The reversal of 20511272 is 27211502.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 5410276 = 3886^2 + 2326^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281947 + ... + 1281962.

Almost surely, 2^20511272 is an apocalyptic number.

It is an amenable number.

20511272 is a deficient number, since it is larger than the sum of its proper divisors (17947378).

20511272 is a wasteful number, since it uses less digits than its factorization.

20511272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563915 (or 2563911 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20511272 is about 4528.9371821654. The cubic root of 20511272 is about 273.7353368153.

Adding to 20511272 its reverse (27211502), we get a palindrome (47722774).

The spelling of 20511272 in words is "twenty million, five hundred eleven thousand, two hundred seventy-two".