15220985 has 12 divisors (see below), whose sum is σ = 19779372. Its totient is φ = 11239488.

The previous prime is 15220979. The next prime is 15221029. The reversal of 15220985 is 58902251.

It can be written as a sum of positive squares in 6 ways, for example, as 620944 + 14600041 = 788^2 + 3821^2 .

It is not a de Polignac number, because 15220985 - 2⁶ = 15220921 is a prime.

It is a Duffinian 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 in 11 ways as a sum of consecutive naturals, for example, 8162 + ... + 9851.

It is an arithmetic number, because the mean of its divisors is an integer number (1648281).

Almost surely, 2^15220985 is an apocalyptic number.

It is an amenable number.

15220985 is a deficient number, since it is larger than the sum of its proper divisors (4558387).

15220985 is a wasteful number, since it uses less digits than its factorization.

15220985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044 (or 18031 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 15220985 is about 3901.4080791427. The cubic root of 15220985 is about 247.8264101302.

The spelling of 15220985 in words is "fifteen million, two hundred twenty thousand, nine hundred eighty-five".