20630155 has 16 divisors (see below), whose sum is σ = 30469824. Its totient is φ = 13057920.

The previous prime is 20630147. The next prime is 20630167. The reversal of 20630155 is 55103602.

It is a happy number.

It is not a de Polignac number, because 20630155 - 2³ = 20630147 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 22216 + ... + 23125.

It is an arithmetic number, because the mean of its divisors is an integer number (1904364).

Almost surely, 2^20630155 is an apocalyptic number.

20630155 is a deficient number, since it is larger than the sum of its proper divisors (9839669).

20630155 is a wasteful number, since it uses less digits than its factorization.

20630155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45366.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20630155 is about 4542.0430425085. The cubic root of 20630155 is about 274.2631735388.

Adding to 20630155 its reverse (55103602), we get a palindrome (75733757).

The spelling of 20630155 in words is "twenty million, six hundred thirty thousand, one hundred fifty-five".