15220555 has 8 divisors (see below), whose sum is σ = 20873952. Its totient is φ = 10436928.

The previous prime is 15220529. The next prime is 15220567. The reversal of 15220555 is 55502251.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15220555 - 2¹⁹ = 14696267 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217402 + ... + 217471.

It is an arithmetic number, because the mean of its divisors is an integer number (2609244).

Almost surely, 2^15220555 is an apocalyptic number.

15220555 is a deficient number, since it is larger than the sum of its proper divisors (5653397).

15220555 is an equidigital number, since it uses as much as digits as its factorization.

15220555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434885.

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

The square root of 15220555 is about 3901.3529704450. The cubic root of 15220555 is about 247.8240763706.

The spelling of 15220555 in words is "fifteen million, two hundred twenty thousand, five hundred fifty-five".