20353404 has 24 divisors (see below), whose sum is σ = 48775888. Its totient is φ = 6600960.

The previous prime is 20353393. The next prime is 20353429. The reversal of 20353404 is 40435302.

It is a happy number.

It is a super-2 number, since 2×20353404² = 828522108774432, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 22477 + ... + 23364.

Almost surely, 2^20353404 is an apocalyptic number.

It is an amenable number.

20353404 is an abundant number, since it is smaller than the sum of its proper divisors (28422484).

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

20353404 is a wasteful number, since it uses less digits than its factorization.

20353404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45885 (or 45883 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20353404 is about 4511.4747034645. The cubic root of 20353404 is about 273.0312460043.

Adding to 20353404 its reverse (40435302), we get a palindrome (60788706).

The spelling of 20353404 in words is "twenty million, three hundred fifty-three thousand, four hundred four".