20730528361 has 3 divisors (see below), whose sum is σ = 20730672343. Its totient is φ = 20730384380.

The previous prime is 20730528349. The next prime is 20730528367. The reversal of 20730528361 is 16382503702.

The square root of 20730528361 is 143981.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 11678908761 + 9051619600 = 108069^2 + 95140^2 .

It is not a de Polignac number, because 20730528361 - 2¹³ = 20730520169 is a prime.

It is a super-2 number, since 2×20730528361² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20730528361.

It is not an unprimeable number, because it can be changed into a prime (20730528367) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 71991 + ... + 215971.

Almost surely, 2^20730528361 is an apocalyptic number.

20730528361 is the 143981-st square number.

20730528361 is the 71991-st centered octagonal number.

It is an amenable number.

20730528361 is a deficient number, since it is larger than the sum of its proper divisors (143982).

20730528361 is an frugal number, since it uses more digits than its factorization.

20730528361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287962 (or 143981 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20730528361 in words is "twenty billion, seven hundred thirty million, five hundred twenty-eight thousand, three hundred sixty-one".