20571272 has 8 divisors (see below), whose sum is σ = 38571150. Its totient is φ = 10285632.

The previous prime is 20571253. The next prime is 20571283. The reversal of 20571272 is 27217502.

It can be written as a sum of positive squares in only one way, i.e., 15792676 + 4778596 = 3974^2 + 2186^2 .

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

It is a congruent number.

It is an unprimeable number.

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, 1285697 + ... + 1285712.

Almost surely, 2^20571272 is an apocalyptic number.

It is an amenable number.

20571272 is a deficient number, since it is larger than the sum of its proper divisors (17999878).

20571272 is a wasteful number, since it uses less digits than its factorization.

20571272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571415 (or 2571411 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20571272 is about 4535.5564157003. The cubic root of 20571272 is about 274.0019890811.

Adding to 20571272 its reverse (27217502), we get a palindrome (47788774).

The spelling of 20571272 in words is "twenty million, five hundred seventy-one thousand, two hundred seventy-two".