20353340 has 24 divisors (see below), whose sum is σ = 48848352. Its totient is φ = 6978240.

The previous prime is 20353283. The next prime is 20353373. The reversal of 20353340 is 4335302.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 72551 + ... + 72830.

It is an arithmetic number, because the mean of its divisors is an integer number (2035348).

Almost surely, 2^20353340 is an apocalyptic number.

20353340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20353340 is an abundant number, since it is smaller than the sum of its proper divisors (28495012).

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

20353340 is a wasteful number, since it uses less digits than its factorization.

20353340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145397 (or 145395 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 20.

The square root of 20353340 is about 4511.4676104345. The cubic root of 20353340 is about 273.0309598275.

Adding to 20353340 its reverse (4335302), we get a palindrome (24688642).

The spelling of 20353340 in words is "twenty million, three hundred fifty-three thousand, three hundred forty".