20155216 has 10 divisors (see below), whose sum is σ = 39050762. Its totient is φ = 10077600.

The previous prime is 20155169. The next prime is 20155249. The reversal of 20155216 is 61255102.

It can be written as a sum of positive squares in only one way, i.e., 16842816 + 3312400 = 4104^2 + 1820^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 629835 + ... + 629866.

Almost surely, 2^20155216 is an apocalyptic number.

It is an amenable number.

20155216 is a deficient number, since it is larger than the sum of its proper divisors (18895546).

20155216 is a wasteful number, since it uses less digits than its factorization.

20155216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259709 (or 1259703 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 20155216 is about 4489.4560917777. The cubic root of 20155216 is about 272.1421546436.

It can be divided in two parts, 20 and 155216, that added together give a square (155236 = 394²).

The spelling of 20155216 in words is "twenty million, one hundred fifty-five thousand, two hundred sixteen".