20921343 has 8 divisors (see below), whose sum is σ = 28012800. Its totient is φ = 13888728.

The previous prime is 20921321. The next prime is 20921347. The reversal of 20921343 is 34312902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20921343 - 2¹⁷ = 20790271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20921347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13873 + ... + 15306.

It is an arithmetic number, because the mean of its divisors is an integer number (3501600).

Almost surely, 2^20921343 is an apocalyptic number.

20921343 is a deficient number, since it is larger than the sum of its proper divisors (7091457).

20921343 is a wasteful number, since it uses less digits than its factorization.

20921343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29421.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20921343 is about 4573.9854612799. The cubic root of 20921343 is about 275.5475284243.

The spelling of 20921343 in words is "twenty million, nine hundred twenty-one thousand, three hundred forty-three".