20261384 has 64 divisors (see below), whose sum is σ = 45360000. Its totient is φ = 8363520.

The previous prime is 20261363. The next prime is 20261407. The reversal of 20261384 is 48316202.

It is a super-3 number, since 3×20261384³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101717 + ... + 101915.

It is an arithmetic number, because the mean of its divisors is an integer number (708750).

Almost surely, 2^20261384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20261384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22680000).

20261384 is an abundant number, since it is smaller than the sum of its proper divisors (25098616).

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

20261384 is a wasteful number, since it uses less digits than its factorization.

20261384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20261384 is about 4501.2647111673. The cubic root of 20261384 is about 272.6191561487.

Adding to 20261384 its reverse (48316202), we get a palindrome (68577586).

The spelling of 20261384 in words is "twenty million, two hundred sixty-one thousand, three hundred eighty-four".