20428472 has 8 divisors (see below), whose sum is σ = 38303400. Its totient is φ = 10214232.

The previous prime is 20428469. The next prime is 20428487. The reversal of 20428472 is 27482402.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 1276772 + ... + 1276787.

It is an arithmetic number, because the mean of its divisors is an integer number (4787925).

Almost surely, 2^20428472 is an apocalyptic number.

It is an amenable number.

20428472 is a deficient number, since it is larger than the sum of its proper divisors (17874928).

20428472 is a wasteful number, since it uses less digits than its factorization.

20428472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553565 (or 2553561 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20428472 is about 4519.7867206318. The cubic root of 20428472 is about 273.3665013620.

The spelling of 20428472 in words is "twenty million, four hundred twenty-eight thousand, four hundred seventy-two".