20861148 has 96 divisors (see below), whose sum is σ = 61544448. Its totient is φ = 5342400.

The previous prime is 20861143. The next prime is 20861167. The reversal of 20861148 is 84116802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20861143) 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 31 ways as a sum of consecutive naturals, for example, 98763 + ... + 98973.

It is an arithmetic number, because the mean of its divisors is an integer number (641088).

Almost surely, 2^20861148 is an apocalyptic number.

20861148 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 20861148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30772224).

20861148 is an abundant number, since it is smaller than the sum of its proper divisors (40683300).

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

20861148 is a wasteful number, since it uses less digits than its factorization.

20861148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 20861148 is about 4567.4005736305. The cubic root of 20861148 is about 275.2830056255.

It can be divided in two parts, 20 and 861148, that added together give a palindrome (861168).

The spelling of 20861148 in words is "twenty million, eight hundred sixty-one thousand, one hundred forty-eight".