20472646445 has 4 divisors (see below), whose sum is σ = 24567175740. Its totient is φ = 16378117152.

The previous prime is 20472646421. The next prime is 20472646459. The reversal of 20472646445 is 54464627402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12394591561 + 8078054884 = 111331^2 + 89878^2 .

It is a cyclic number.

It is not a de Polignac number, because 20472646445 - 2⁸ = 20472646189 is a prime.

It is a super-2 number, since 2×20472646445² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20472646396 and 20472646405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2047264640 + ... + 2047264649.

It is an arithmetic number, because the mean of its divisors is an integer number (6141793935).

Almost surely, 2^20472646445 is an apocalyptic number.

It is an amenable number.

20472646445 is a deficient number, since it is larger than the sum of its proper divisors (4094529295).

20472646445 is an equidigital number, since it uses as much as digits as its factorization.

20472646445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094529294.

The product of its (nonzero) digits is 1290240, while the sum is 44.

The spelling of 20472646445 in words is "twenty billion, four hundred seventy-two million, six hundred forty-six thousand, four hundred forty-five".