1564525020 has 96 divisors (see below), whose sum is σ = 4584299328. Its totient is φ = 398241792.

The previous prime is 1564525013. The next prime is 1564525051. The reversal of 1564525020 is 205254651.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111012 + ... + 124308.

It is an arithmetic number, because the mean of its divisors is an integer number (47753118).

Almost surely, 2^1564525020 is an apocalyptic number.

1564525020 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 1564525020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2292149664).

1564525020 is an abundant number, since it is smaller than the sum of its proper divisors (3019774308).

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

1564525020 is a wasteful number, since it uses less digits than its factorization.

1564525020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13399 (or 13397 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1564525020 is about 39554.0771602625. The cubic root of 1564525020 is about 1160.8982885418.

Adding to 1564525020 its reverse (205254651), we get a palindrome (1769779671).

The spelling of 1564525020 in words is "one billion, five hundred sixty-four million, five hundred twenty-five thousand, twenty".