15220780 has 48 divisors (see below), whose sum is σ = 34292160. Its totient is φ = 5654528.

The previous prime is 15220747. The next prime is 15220819. The reversal of 15220780 is 8702251.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30009 + ... + 30511.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^15220780 is an apocalyptic number.

15220780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15220780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17146080).

15220780 is an abundant number, since it is smaller than the sum of its proper divisors (19071380).

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

15220780 is a wasteful number, since it uses less digits than its factorization.

15220780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 15220780 is about 3901.3818064886. The cubic root of 15220780 is about 247.8252975294.

The spelling of 15220780 in words is "fifteen million, two hundred twenty thousand, seven hundred eighty".