20213316 has 36 divisors (see below), whose sum is σ = 51251200. Its totient is φ = 6717168.

The previous prime is 20213309. The next prime is 20213317. The reversal of 20213316 is 61331202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20213317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15165 + ... + 16443.

Almost surely, 2^20213316 is an apocalyptic number.

It is an amenable number.

20213316 is an abundant number, since it is smaller than the sum of its proper divisors (31037884).

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

20213316 is a wasteful number, since it uses less digits than its factorization.

20213316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20213316 is about 4495.9221523510. The cubic root of 20213316 is about 272.4033986910.

Adding to 20213316 its reverse (61331202), we get a palindrome (81544518).

The spelling of 20213316 in words is "twenty million, two hundred thirteen thousand, three hundred sixteen".