1564220220 has 144 divisors (see below), whose sum is σ = 4656966048. Its totient is φ = 392232960.

The previous prime is 1564220173. The next prime is 1564220249. The reversal of 1564220220 is 220224651.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5566480 + ... + 5566760.

It is an arithmetic number, because the mean of its divisors is an integer number (32340042).

Almost surely, 2^1564220220 is an apocalyptic number.

1564220220 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 1564220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2328483024).

1564220220 is an abundant number, since it is smaller than the sum of its proper divisors (3092745828).

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

1564220220 is a wasteful number, since it uses less digits than its factorization.

1564220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1564220220 is about 39550.2240195931. The cubic root of 1564220220 is about 1160.8228950998.

Adding to 1564220220 its reverse (220224651), we get a palindrome (1784444871).

The spelling of 1564220220 in words is "one billion, five hundred sixty-four million, two hundred twenty thousand, two hundred twenty".