20023153444 has 96 divisors (see below), whose sum is σ = 41638012416. Its totient is φ = 8248780800.

The previous prime is 20023153441. The next prime is 20023153457. The reversal of 20023153444 is 44435132002.

It is a happy number.

It is a super-2 number, since 2×20023153444² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (20023153441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15437404 + ... + 15438700.

It is an arithmetic number, because the mean of its divisors is an integer number (433729296).

Almost surely, 2^20023153444 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 20023153444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20819006208).

20023153444 is an abundant number, since it is smaller than the sum of its proper divisors (21614858972).

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

20023153444 is a wasteful number, since it uses less digits than its factorization.

20023153444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565 (or 1563 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20023153444 its reverse (44435132002), we get a palindrome (64458285446).

The spelling of 20023153444 in words is "twenty billion, twenty-three million, one hundred fifty-three thousand, four hundred forty-four".