20630355 has 8 divisors (see below), whose sum is σ = 33008592. Its totient is φ = 11002848.

The previous prime is 20630327. The next prime is 20630359. The reversal of 20630355 is 55303602.

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

It is not a de Polignac number, because 20630355 - 2¹⁰ = 20629331 is a prime.

It is a super-2 number, since 2×20630355² = 851223094852050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20630359) 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, 687664 + ... + 687693.

It is an arithmetic number, because the mean of its divisors is an integer number (4126074).

Almost surely, 2^20630355 is an apocalyptic number.

20630355 is a deficient number, since it is larger than the sum of its proper divisors (12378237).

20630355 is a wasteful number, since it uses less digits than its factorization.

20630355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375365.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 20630355 is about 4542.0650589792. The cubic root of 20630355 is about 274.2640598216.

Adding to 20630355 its reverse (55303602), we get a palindrome (75933957).

The spelling of 20630355 in words is "twenty million, six hundred thirty thousand, three hundred fifty-five".