20493720 has 192 divisors, whose sum is σ = 74692800. Its totient is φ = 4838400.

The previous prime is 20493719. The next prime is 20493731. The reversal of 20493720 is 2739402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135645 + ... + 135795.

It is an arithmetic number, because the mean of its divisors is an integer number (389025).

Almost surely, 2^20493720 is an apocalyptic number.

20493720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20493720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37346400).

20493720 is an abundant number, since it is smaller than the sum of its proper divisors (54199080).

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

20493720 is a wasteful number, since it uses less digits than its factorization.

20493720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20493720 is about 4526.9990059641. Note that the first 3 decimals coincide. The cubic root of 20493720 is about 273.6572338458.

The spelling of 20493720 in words is "twenty million, four hundred ninety-three thousand, seven hundred twenty".