20205128 has 32 divisors (see below), whose sum is σ = 39123000. Its totient is φ = 9776640.

The previous prime is 20205121. The next prime is 20205139. The reversal of 20205128 is 82150202.

It can be written as a sum of positive squares in 4 ways, for example, as 12264004 + 7941124 = 3502^2 + 2818^2 .

It is not an unprimeable number, because it can be changed into a prime (20205121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74978 + ... + 75246.

Almost surely, 2^20205128 is an apocalyptic number.

It is an amenable number.

20205128 is a deficient number, since it is larger than the sum of its proper divisors (18917872).

20205128 is a wasteful number, since it uses less digits than its factorization.

20205128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20205128 is about 4495.0114571600. The cubic root of 20205128 is about 272.3666120456.

The spelling of 20205128 in words is "twenty million, two hundred five thousand, one hundred twenty-eight".