20493210 has 64 divisors (see below), whose sum is σ = 52329600. Its totient is φ = 5121792.

The previous prime is 20493197. The next prime is 20493257. The reversal of 20493210 is 1239402.

It is a super-2 number, since 2×20493210² = 839943312208200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89376 + ... + 89604.

It is an arithmetic number, because the mean of its divisors is an integer number (817650).

Almost surely, 2^20493210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20493210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26164800).

20493210 is an abundant number, since it is smaller than the sum of its proper divisors (31836390).

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

20493210 is a wasteful number, since it uses less digits than its factorization.

20493210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20493210 is about 4526.9426769068. The cubic root of 20493210 is about 273.6549637788.

The spelling of 20493210 in words is "twenty million, four hundred ninety-three thousand, two hundred ten".