20797497 has 48 divisors (see below), whose sum is σ = 37060608. Its totient is φ = 10977120.

The previous prime is 20797493. The next prime is 20797499. The reversal of 20797497 is 79479702.

It is a happy number.

It is not a de Polignac number, because 20797497 - 2² = 20797493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20797493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44688 + ... + 45150.

It is an arithmetic number, because the mean of its divisors is an integer number (772096).

Almost surely, 2^20797497 is an apocalyptic number.

It is an amenable number.

20797497 is a deficient number, since it is larger than the sum of its proper divisors (16263111).

20797497 is a wasteful number, since it uses less digits than its factorization.

20797497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 20797497 is about 4560.4272826129. The cubic root of 20797497 is about 275.0027415705.

The spelling of 20797497 in words is "twenty million, seven hundred ninety-seven thousand, four hundred ninety-seven".