20797513 has 8 divisors (see below), whose sum is σ = 22790880. Its totient is φ = 18821280.

The previous prime is 20797507. The next prime is 20797531. The reversal of 20797513 is 31579702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20797513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20797583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1668 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (2848860).

Almost surely, 2^20797513 is an apocalyptic number.

It is an amenable number.

20797513 is a deficient number, since it is larger than the sum of its proper divisors (1993367).

20797513 is a wasteful number, since it uses less digits than its factorization.

20797513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8567.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 20797513 is about 4560.4290368341. The cubic root of 20797513 is about 275.0028120925.

The spelling of 20797513 in words is "twenty million, seven hundred ninety-seven thousand, five hundred thirteen".