20128953 has 8 divisors (see below), whose sum is σ = 28903168. Its totient is φ = 12387024.

The previous prime is 20128943. The next prime is 20128957. The reversal of 20128953 is 35982102.

It is a happy number.

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

It is not a de Polignac number, because 20128953 - 2⁴ = 20128937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20128953.

It is not an unprimeable number, because it can be changed into a prime (20128957) 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, 258025 + ... + 258102.

It is an arithmetic number, because the mean of its divisors is an integer number (3612896).

Almost surely, 2^20128953 is an apocalyptic number.

It is an amenable number.

20128953 is a deficient number, since it is larger than the sum of its proper divisors (8774215).

20128953 is a wasteful number, since it uses less digits than its factorization.

20128953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516143.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20128953 is about 4486.5301737534. The cubic root of 20128953 is about 272.0238994643.

The spelling of 20128953 in words is "twenty million, one hundred twenty-eight thousand, nine hundred fifty-three".