15220240 has 40 divisors (see below), whose sum is σ = 40443840. Its totient is φ = 5218176.

The previous prime is 15220193. The next prime is 15220241. The reversal of 15220240 is 4202251.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (15220241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13030 + ... + 14149.

It is an arithmetic number, because the mean of its divisors is an integer number (1011096).

Almost surely, 2^15220240 is an apocalyptic number.

15220240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15220240 is an abundant number, since it is smaller than the sum of its proper divisors (25223600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15220240 is a wasteful number, since it uses less digits than its factorization.

15220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27199 (or 27193 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 15220240 is about 3901.3125996259. The cubic root of 15220240 is about 247.8223667281.

Adding to 15220240 its reverse (4202251), we get a palindrome (19422491).

The spelling of 15220240 in words is "fifteen million, two hundred twenty thousand, two hundred forty".