20723052 has 96 divisors (see below), whose sum is σ = 58705920. Its totient is φ = 5564160.

The previous prime is 20723047. The next prime is 20723063. The reversal of 20723052 is 25032702.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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, 114402 + ... + 114582.

It is an arithmetic number, because the mean of its divisors is an integer number (611520).

Almost surely, 2^20723052 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 20723052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29352960).

20723052 is an abundant number, since it is smaller than the sum of its proper divisors (37982868).

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

20723052 is a wasteful number, since it uses less digits than its factorization.

20723052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20723052 is about 4552.2579013057. The cubic root of 20723052 is about 274.6742235905.

Adding to 20723052 its reverse (25032702), we get a palindrome (45755754).

The spelling of 20723052 in words is "twenty million, seven hundred twenty-three thousand, fifty-two".