20552155 has 16 divisors (see below), whose sum is σ = 27478080. Its totient is φ = 14652288.

The previous prime is 20552149. The next prime is 20552171. The reversal of 20552155 is 55125502.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20552155 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3567 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (1717380).

Almost surely, 2^20552155 is an apocalyptic number.

20552155 is a deficient number, since it is larger than the sum of its proper divisors (6925925).

20552155 is a wasteful number, since it uses less digits than its factorization.

20552155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 20552155 is about 4533.4484666752. The cubic root of 20552155 is about 273.9170855732.

Adding to 20552155 its reverse (55125502), we get a palindrome (75677657).

The spelling of 20552155 in words is "twenty million, five hundred fifty-two thousand, one hundred fifty-five".