20971528 has 16 divisors (see below), whose sum is σ = 39623760. Its totient is φ = 10405200.

The previous prime is 20971507. The next prime is 20971529. The reversal of 20971528 is 82517902.

It is a junction number, because it is equal to n+sod(n) for n = 20971493 and 20971502.

It is not an unprimeable number, because it can be changed into a prime (20971529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8958 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (2476485).

Almost surely, 2^20971528 is an apocalyptic number.

It is an amenable number.

20971528 is a deficient number, since it is larger than the sum of its proper divisors (18652232).

20971528 is a wasteful number, since it uses less digits than its factorization.

20971528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20148 (or 20144 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20971528 is about 4579.4680913835. The cubic root of 20971528 is about 275.7676753897.

It can be divided in two parts, 2097152 and 8, that multiplied together give a 24-th power (16777216 = 2²⁴).

The spelling of 20971528 in words is "twenty million, nine hundred seventy-one thousand, five hundred twenty-eight".