20561351360 has 56 divisors (see below), whose sum is σ = 53412792336. Its totient is φ = 7476853760.

The previous prime is 20561351351. The next prime is 20561351399. The reversal of 20561351360 is 6315316502.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2917127 + ... + 2924166.

Almost surely, 2^20561351360 is an apocalyptic number.

20561351360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20561351360 is an abundant number, since it is smaller than the sum of its proper divisors (32851440976).

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

20561351360 is a wasteful number, since it uses less digits than its factorization.

20561351360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5841321 (or 5841311 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 20561351360 its reverse (6315316502), we get a palindrome (26876667862).

The spelling of 20561351360 in words is "twenty billion, five hundred sixty-one million, three hundred fifty-one thousand, three hundred sixty".