20995128 has 144 divisors (see below), whose sum is σ = 72291960. Its totient is φ = 5443200.

The previous prime is 20995127. The next prime is 20995129. The reversal of 20995128 is 82159902.

It is an interprime number because it is at equal distance from previous prime (20995127) and next prime (20995129).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20995092 and 20995101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20995123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 38538 + ... + 39078.

Almost surely, 2^20995128 is an apocalyptic number.

20995128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20995128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36145980).

20995128 is an abundant number, since it is smaller than the sum of its proper divisors (51296832).

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

20995128 is a wasteful number, since it uses less digits than its factorization.

20995128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 20995128 is about 4582.0440853401. The cubic root of 20995128 is about 275.8710803076.

It can be divided in two parts, 2099 and 5128, that added together give a palindrome (7227).

The spelling of 20995128 in words is "twenty million, nine hundred ninety-five thousand, one hundred twenty-eight".