20825428 has 24 divisors (see below), whose sum is σ = 40517120. Its totient is φ = 9300960.

The previous prime is 20825423. The next prime is 20825437. The reversal of 20825428 is 82452802.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 20825428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20825423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4848 + ... + 8071.

Almost surely, 2^20825428 is an apocalyptic number.

It is an amenable number.

20825428 is a deficient number, since it is larger than the sum of its proper divisors (19691692).

20825428 is a wasteful number, since it uses less digits than its factorization.

20825428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12967 (or 12965 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 20825428 is about 4563.4885778317. The cubic root of 20825428 is about 275.1257958907.

The spelling of 20825428 in words is "twenty million, eight hundred twenty-five thousand, four hundred twenty-eight".