20506332 has 48 divisors (see below), whose sum is σ = 59657472. Its totient is φ = 5326080.

The previous prime is 20506331. The next prime is 20506337. The reversal of 20506332 is 23360502.

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

It is a junction number, because it is equal to n+sod(n) for n = 20506299 and 20506308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10173 + ... + 12020.

It is an arithmetic number, because the mean of its divisors is an integer number (1242864).

Almost surely, 2^20506332 is an apocalyptic number.

20506332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20506332 is an abundant number, since it is smaller than the sum of its proper divisors (39151140).

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

20506332 is a wasteful number, since it uses less digits than its factorization.

20506332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22218 (or 22216 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20506332 is about 4528.3917675042. The cubic root of 20506332 is about 273.7133592877.

Adding to 20506332 its reverse (23360502), we get a palindrome (43866834).

The spelling of 20506332 in words is "twenty million, five hundred six thousand, three hundred thirty-two".