15220606 has 4 divisors (see below), whose sum is σ = 22830912. Its totient is φ = 7610302.

The previous prime is 15220603. The next prime is 15220607. The reversal of 15220606 is 60602251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60602251 = 4597 ⋅13183.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15220603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3805150 + ... + 3805153.

It is an arithmetic number, because the mean of its divisors is an integer number (5707728).

Almost surely, 2^15220606 is an apocalyptic number.

15220606 is a deficient number, since it is larger than the sum of its proper divisors (7610306).

15220606 is an equidigital number, since it uses as much as digits as its factorization.

15220606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610305.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 15220606 is about 3901.3595066336. The cubic root of 15220606 is about 247.8243531677.

Adding to 15220606 its reverse (60602251), we get a palindrome (75822857).

The spelling of 15220606 in words is "fifteen million, two hundred twenty thousand, six hundred six".