20628413 has 8 divisors (see below), whose sum is σ = 22520568. Its totient is φ = 18779904.

The previous prime is 20628409. The next prime is 20628437. The reversal of 20628413 is 31482602.

It can be written as a sum of positive squares in 4 ways, for example, as 34969 + 20593444 = 187^2 + 4538^2 .

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

It is not a de Polignac number, because 20628413 - 2² = 20628409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9920 + ... + 11817.

It is an arithmetic number, because the mean of its divisors is an integer number (2815071).

Almost surely, 2^20628413 is an apocalyptic number.

It is an amenable number.

20628413 is a deficient number, since it is larger than the sum of its proper divisors (1892155).

20628413 is a wasteful number, since it uses less digits than its factorization.

20628413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21823.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20628413 is about 4541.8512745355. The cubic root of 20628413 is about 274.2554537730.

The spelling of 20628413 in words is "twenty million, six hundred twenty-eight thousand, four hundred thirteen".