20249340 has 24 divisors (see below), whose sum is σ = 56698320. Its totient is φ = 5399808.

The previous prime is 20249321. The next prime is 20249353. The reversal of 20249340 is 4394202.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20249340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168685 + ... + 168804.

It is an arithmetic number, because the mean of its divisors is an integer number (2362430).

Almost surely, 2^20249340 is an apocalyptic number.

20249340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20249340 is an abundant number, since it is smaller than the sum of its proper divisors (36448980).

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

20249340 is a wasteful number, since it uses less digits than its factorization.

20249340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337501 (or 337499 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20249340 is about 4499.9266660691. The cubic root of 20249340 is about 272.5651276591.

The spelling of 20249340 in words is "twenty million, two hundred forty-nine thousand, three hundred forty".