20653155 has 12 divisors (see below), whose sum is σ = 35798880. Its totient is φ = 11014992.

The previous prime is 20653153. The next prime is 20653159. The reversal of 20653155 is 55135602.

20653155 is a `hidden beast` number, since 2 + 0 + 653 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 20653155 - 2¹ = 20653153 is a prime.

It is a super-2 number, since 2×20653155² = 853105622908050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20653151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229435 + ... + 229524.

It is an arithmetic number, because the mean of its divisors is an integer number (2983240).

Almost surely, 2^20653155 is an apocalyptic number.

20653155 is a deficient number, since it is larger than the sum of its proper divisors (15145725).

20653155 is a wasteful number, since it uses less digits than its factorization.

20653155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458970 (or 458967 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 20653155 is about 4544.5742374836. The cubic root of 20653155 is about 274.3650585419.

Adding to 20653155 its reverse (55135602), we get a palindrome (75788757).

It can be divided in two parts, 206 and 53155, that added together give a square (53361 = 231²).

The spelling of 20653155 in words is "twenty million, six hundred fifty-three thousand, one hundred fifty-five".