20293240 has 64 divisors (see below), whose sum is σ = 52760160. Its totient is φ = 6942720.

The previous prime is 20293219. The next prime is 20293241. The reversal of 20293240 is 4239202.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20293241) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6124 + ... + 8836.

Almost surely, 2^20293240 is an apocalyptic number.

20293240 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 20293240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26380080).

20293240 is an abundant number, since it is smaller than the sum of its proper divisors (32466920).

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

20293240 is a wasteful number, since it uses less digits than its factorization.

20293240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752 (or 2748 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20293240 is about 4504.8018824361. The cubic root of 20293240 is about 272.7619566663.

The spelling of 20293240 in words is "twenty million, two hundred ninety-three thousand, two hundred forty".