20448155 has 24 divisors (see below), whose sum is σ = 30375072. Its totient is φ = 12939264.

The previous prime is 20448133. The next prime is 20448163. The reversal of 20448155 is 55184402.

20448155 = T₄₂ + T₄₃ + ... + T₄₉₆.

It is not a de Polignac number, because 20448155 - 2⁸ = 20447899 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4187 + ... + 7643.

It is an arithmetic number, because the mean of its divisors is an integer number (1265628).

Almost surely, 2^20448155 is an apocalyptic number.

20448155 is a deficient number, since it is larger than the sum of its proper divisors (9926917).

20448155 is a wasteful number, since it uses less digits than its factorization.

20448155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3495 (or 3482 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 20448155 is about 4521.9636221447. The cubic root of 20448155 is about 273.4542701334.

The spelling of 20448155 in words is "twenty million, four hundred forty-eight thousand, one hundred fifty-five".