20403345 has 8 divisors (see below), whose sum is σ = 32645376. Its totient is φ = 10881776.

The previous prime is 20403337. The next prime is 20403353. The reversal of 20403345 is 54330402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20403337) and next prime (20403353).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20403345 - 2³ = 20403337 is a prime.

It is a Curzon 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, 680097 + ... + 680126.

It is an arithmetic number, because the mean of its divisors is an integer number (4080672).

Almost surely, 2^20403345 is an apocalyptic number.

It is an amenable number.

20403345 is a deficient number, since it is larger than the sum of its proper divisors (12242031).

20403345 is a wasteful number, since it uses less digits than its factorization.

20403345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360231.

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

The square root of 20403345 is about 4517.0061988003. The cubic root of 20403345 is about 273.2543752039.

Adding to 20403345 its reverse (54330402), we get a palindrome (74733747).

The spelling of 20403345 in words is "twenty million, four hundred three thousand, three hundred forty-five".