20997519244 has 36 divisors (see below), whose sum is σ = 39804379776. Its totient is φ = 9687582528.

The previous prime is 20997519239. The next prime is 20997519251. The reversal of 20997519244 is 44291579902.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 20997519191 and 20997519200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2952597 + ... + 2959699.

It is an arithmetic number, because the mean of its divisors is an integer number (1105677216).

Almost surely, 2^20997519244 is an apocalyptic number.

It is an amenable number.

20997519244 is a deficient number, since it is larger than the sum of its proper divisors (18806860532).

20997519244 is a wasteful number, since it uses less digits than its factorization.

20997519244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11506 (or 11491 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 20997519244 in words is "twenty billion, nine hundred ninety-seven million, five hundred nineteen thousand, two hundred forty-four".