20972493445 has 8 divisors (see below), whose sum is σ = 26647403544. Its totient is φ = 15791053824.

The previous prime is 20972493413. The next prime is 20972493461. The reversal of 20972493445 is 54439427902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1501640001 + 19470853444 = 38751^2 + 139538^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20972493445 - 2⁵ = 20972493413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123367524 + ... + 123367693.

It is an arithmetic number, because the mean of its divisors is an integer number (3330925443).

Almost surely, 2^20972493445 is an apocalyptic number.

It is an amenable number.

20972493445 is a deficient number, since it is larger than the sum of its proper divisors (5674910099).

20972493445 is a wasteful number, since it uses less digits than its factorization.

20972493445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246735239.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 20972493445 in words is "twenty billion, nine hundred seventy-two million, four hundred ninety-three thousand, four hundred forty-five".