20973330 has 128 divisors (see below), whose sum is σ = 65180160. Its totient is φ = 4758912.

The previous prime is 20973317. The next prime is 20973331. The reversal of 20973330 is 3337902.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20973294 and 20973303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 153022 + ... + 153158.

It is an arithmetic number, because the mean of its divisors is an integer number (509220).

Almost surely, 2^20973330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20973330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32590080).

20973330 is an abundant number, since it is smaller than the sum of its proper divisors (44206830).

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

20973330 is an equidigital number, since it uses as much as digits as its factorization.

20973330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 27.

The square root of 20973330 is about 4579.6648348979. The cubic root of 20973330 is about 275.7755737034.

The spelling of 20973330 in words is "twenty million, nine hundred seventy-three thousand, three hundred thirty".