20913216 has 28 divisors (see below), whose sum is σ = 55333392. Its totient is φ = 6971008.

The previous prime is 20913203. The next prime is 20913229. The reversal of 20913216 is 61231902.

It is an interprime number because it is at equal distance from previous prime (20913203) and next prime (20913229).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 54270 + ... + 54653.

Almost surely, 2^20913216 is an apocalyptic number.

It is an amenable number.

20913216 is an abundant number, since it is smaller than the sum of its proper divisors (34420176).

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

20913216 is a wasteful number, since it uses less digits than its factorization.

20913216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108938 (or 108928 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20913216 is about 4573.0969812590. The cubic root of 20913216 is about 275.5118445330.

The spelling of 20913216 in words is "twenty million, nine hundred thirteen thousand, two hundred sixteen".