20261616570 has 192 divisors, whose sum is σ = 59109523200. Its totient is φ = 4782689280.

The previous prime is 20261616457. The next prime is 20261616577. The reversal of 20261616570 is 7561616202.

It is a happy number.

20261616570 is a `hidden beast` number, since 2 + 0 + 26 + 1 + 61 + 6 + 570 = 666.

It is not an unprimeable number, because it can be changed into a prime (20261616577) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2826651 + ... + 2833809.

It is an arithmetic number, because the mean of its divisors is an integer number (307862100).

Almost surely, 2^20261616570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20261616570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29554761600).

20261616570 is an abundant number, since it is smaller than the sum of its proper divisors (38847906630).

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

20261616570 is a wasteful number, since it uses less digits than its factorization.

20261616570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7285 (or 7282 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 20261616570 in words is "twenty billion, two hundred sixty-one million, six hundred sixteen thousand, five hundred seventy".