20128502 has 8 divisors (see below), whose sum is σ = 30835296. Its totient is φ = 9850072.

The previous prime is 20128501. The next prime is 20128513. The reversal of 20128502 is 20582102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128501) 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 3 ways as a sum of consecutive naturals, for example, 106973 + ... + 107160.

It is an arithmetic number, because the mean of its divisors is an integer number (3854412).

Almost surely, 2^20128502 is an apocalyptic number.

20128502 is a deficient number, since it is larger than the sum of its proper divisors (10706794).

20128502 is a wasteful number, since it uses less digits than its factorization.

20128502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214182.

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

The square root of 20128502 is about 4486.4799119131. The cubic root of 20128502 is about 272.0218678353.

The spelling of 20128502 in words is "twenty million, one hundred twenty-eight thousand, five hundred two".