20245128 has 32 divisors (see below), whose sum is σ = 50803200. Its totient is φ = 6723008.

The previous prime is 20245123. The next prime is 20245151. The reversal of 20245128 is 82154202.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20245098 and 20245107.

It is not an unprimeable number, because it can be changed into a prime (20245123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5593 + ... + 8471.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^20245128 is an apocalyptic number.

It is an amenable number.

20245128 is an abundant number, since it is smaller than the sum of its proper divisors (30558072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20245128 is a wasteful number, since it uses less digits than its factorization.

20245128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3181 (or 3177 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20245128 is about 4499.4586341026. The cubic root of 20245128 is about 272.5462278838.

The spelling of 20245128 in words is "twenty million, two hundred forty-five thousand, one hundred twenty-eight".