20345052 has 96 divisors (see below), whose sum is σ = 60411904. Its totient is φ = 5184000.

The previous prime is 20345051. The next prime is 20345069. The reversal of 20345052 is 25054302.

20345052 is nontrivially palindromic in base 5.

It is a super-2 number, since 2×20345052² = 827842281765408, which contains 22 as substring.

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

20345052 is an undulating number in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345051) 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, 33552 + ... + 34152.

Almost surely, 2^20345052 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 20345052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30205952).

20345052 is an abundant number, since it is smaller than the sum of its proper divisors (40066852).

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

20345052 is a wasteful number, since it uses less digits than its factorization.

20345052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20345052 is about 4510.5489688063. The cubic root of 20345052 is about 272.9938948574.

Adding to 20345052 its reverse (25054302), we get a palindrome (45399354).

The spelling of 20345052 in words is "twenty million, three hundred forty-five thousand, fifty-two".