20487341956 has 27 divisors (see below), whose sum is σ = 36500914821. Its totient is φ = 10061747664.

The previous prime is 20487341923. The next prime is 20487341981. The reversal of 20487341956 is 65914378402.

It is a happy number.

The square root of 20487341956 is 143134.

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

It can be written as a sum of positive squares in only one way, i.e., 835788100 + 19651553856 = 28910^2 + 140184^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16889206 + ... + 16890418.

It is a 1-persistent number, because it is pandigital, but 2⋅20487341956 = 40974683912 is not.

Almost surely, 2^20487341956 is an apocalyptic number.

20487341956 is the 143134-th square number.

It is an amenable number.

20487341956 is a deficient number, since it is larger than the sum of its proper divisors (16013572865).

20487341956 is an frugal number, since it uses more digits than its factorization.

20487341956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

Multiplying 20487341956 by its sum of digits (49), we get a square (1003879755844 = 1001938²).

The spelling of 20487341956 in words is "twenty billion, four hundred eighty-seven million, three hundred forty-one thousand, nine hundred fifty-six".