20205266730 has 128 divisors (see below), whose sum is σ = 55021178880. Its totient is φ = 4705309440.

The previous prime is 20205266723. The next prime is 20205266759. The reversal of 20205266730 is 3766250202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20205266691 and 20205266700.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 954117 + ... + 975063.

It is an arithmetic number, because the mean of its divisors is an integer number (429852960).

Almost surely, 2^20205266730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20205266730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27510589440).

20205266730 is an abundant number, since it is smaller than the sum of its proper divisors (34815912150).

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

20205266730 is a wasteful number, since it uses less digits than its factorization.

20205266730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21084.

The product of its (nonzero) digits is 30240, while the sum is 33.

The spelling of 20205266730 in words is "twenty billion, two hundred five million, two hundred sixty-six thousand, seven hundred thirty".