20628345 has 8 divisors (see below), whose sum is σ = 33005376. Its totient is φ = 11001776.

The previous prime is 20628337. The next prime is 20628373. The reversal of 20628345 is 54382602.

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 20628345 - 2³ = 20628337 is a prime.

It is a super-3 number, since 3×20628345³ (a number of 23 digits) contains 333 as substring.

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, 687597 + ... + 687626.

It is an arithmetic number, because the mean of its divisors is an integer number (4125672).

Almost surely, 2^20628345 is an apocalyptic number.

It is an amenable number.

20628345 is a deficient number, since it is larger than the sum of its proper divisors (12377031).

20628345 is a wasteful number, since it uses less digits than its factorization.

20628345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375231.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20628345 is about 4541.8437885951. The cubic root of 20628345 is about 274.2551524185.

The spelling of 20628345 in words is "twenty million, six hundred twenty-eight thousand, three hundred forty-five".