20997250446015 has 16 divisors (see below), whose sum is σ = 37328445237600. Its totient is φ = 11198533571136.

The previous prime is 20997250445999. The next prime is 20997250446049. The reversal of 20997250446015 is 51064405279902.

It is a happy number.

20997250446015 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 7 + 25 + 0 + 4 + 4 + 601 + 5 = 666.

It is not a de Polignac number, because 20997250446015 - 2⁴ = 20997250445999 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77767594110 + ... + 77767594379.

It is an arithmetic number, because the mean of its divisors is an integer number (2333027827350).

Almost surely, 2^{20997250446015} is an apocalyptic number.

20997250446015 is a deficient number, since it is larger than the sum of its proper divisors (16331194791585).

20997250446015 is a wasteful number, since it uses less digits than its factorization.

20997250446015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155535188503 (or 155535188497 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 20997250446015 in words is "twenty trillion, nine hundred ninety-seven billion, two hundred fifty million, four hundred forty-six thousand, fifteen".