20771572 has 6 divisors (see below), whose sum is σ = 36350258. Its totient is φ = 10385784.

The previous prime is 20771563. The next prime is 20771587. The reversal of 20771572 is 27517702.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 2572816 = 4266^2 + 1604^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2596443 + ... + 2596450.

Almost surely, 2^20771572 is an apocalyptic number.

It is an amenable number.

20771572 is a deficient number, since it is larger than the sum of its proper divisors (15578686).

20771572 is a wasteful number, since it uses less digits than its factorization.

20771572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192897 (or 5192895 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 20771572 is about 4557.5840090996. The cubic root of 20771572 is about 274.8884263636. Note that the first 3 decimals are identical.

The spelling of 20771572 in words is "twenty million, seven hundred seventy-one thousand, five hundred seventy-two".