1245013220 has 48 divisors (see below), whose sum is σ = 2862433728. Its totient is φ = 451109760.

The previous prime is 1245013213. The next prime is 1245013261. The reversal of 1245013220 is 223105421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1245013192 and 1245013201.

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, 52262 + ... + 72258.

It is an arithmetic number, because the mean of its divisors is an integer number (59634036).

Almost surely, 2^1245013220 is an apocalyptic number.

1245013220 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 1245013220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431216864).

1245013220 is an abundant number, since it is smaller than the sum of its proper divisors (1617420508).

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

1245013220 is a wasteful number, since it uses less digits than its factorization.

1245013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20300 (or 20298 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1245013220 is about 35284.7448623339. The cubic root of 1245013220 is about 1075.7829435999.

Adding to 1245013220 its reverse (223105421), we get a palindrome (1468118641).

It can be divided in two parts, 124501 and 3220, that added together give a palindrome (127721).

The spelling of 1245013220 in words is "one billion, two hundred forty-five million, thirteen thousand, two hundred twenty".