20091572 has 12 divisors (see below), whose sum is σ = 35555940. Its totient is φ = 9932736.

The previous prime is 20091559. The next prime is 20091587. The reversal of 20091572 is 27519002.

It can be written as a sum of positive squares in 2 ways, for example, as 11115556 + 8976016 = 3334^2 + 2996^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 27863 + ... + 28574.

It is an arithmetic number, because the mean of its divisors is an integer number (2962995).

Almost surely, 2^20091572 is an apocalyptic number.

It is an amenable number.

20091572 is a deficient number, since it is larger than the sum of its proper divisors (15464368).

20091572 is a wasteful number, since it uses less digits than its factorization.

20091572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56530 (or 56528 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20091572 is about 4482.3623235968. The cubic root of 20091572 is about 271.8554054139.

The spelling of 20091572 in words is "twenty million, ninety-one thousand, five hundred seventy-two".