20205523042 has 4 divisors (see below), whose sum is σ = 30308284566. Its totient is φ = 10102761520.

The previous prime is 20205523033. The next prime is 20205523067. The reversal of 20205523042 is 24032550202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18484849681 + 1720673361 = 135959^2 + 41481^2 .

It is a super-2 number, since 2×20205523042² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20205522998 and 20205523016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5051380759 + ... + 5051380762.

Almost surely, 2^20205523042 is an apocalyptic number.

20205523042 is a deficient number, since it is larger than the sum of its proper divisors (10102761524).

20205523042 is a wasteful number, since it uses less digits than its factorization.

20205523042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10102761523.

The product of its (nonzero) digits is 4800, while the sum is 25.

The spelling of 20205523042 in words is "twenty billion, two hundred five million, five hundred twenty-three thousand, forty-two".