20523145106 has 4 divisors (see below), whose sum is σ = 30784717662. Its totient is φ = 10261572552.

The previous prime is 20523145099. The next prime is 20523145117. The reversal of 20523145106 is 60154132502.

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., 19429850881 + 1093294225 = 139391^2 + 33065^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5130786275 + ... + 5130786278.

Almost surely, 2^20523145106 is an apocalyptic number.

20523145106 is a deficient number, since it is larger than the sum of its proper divisors (10261572556).

20523145106 is a wasteful number, since it uses less digits than its factorization.

20523145106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10261572555.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 20523145106 its reverse (60154132502), we get a palindrome (80677277608).

The spelling of 20523145106 in words is "twenty billion, five hundred twenty-three million, one hundred forty-five thousand, one hundred six".