20638597 has 8 divisors (see below), whose sum is σ = 23616000. Its totient is φ = 17668464.

The previous prime is 20638589. The next prime is 20638601. The reversal of 20638597 is 79583602.

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 20638597 - 2³ = 20638589 is a prime.

It is a super-2 number, since 2×20638597² = 851903372256818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638507) 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, 7404 + ... + 9802.

It is an arithmetic number, because the mean of its divisors is an integer number (2952000).

Almost surely, 2^20638597 is an apocalyptic number.

It is an amenable number.

20638597 is a deficient number, since it is larger than the sum of its proper divisors (2977403).

20638597 is a wasteful number, since it uses less digits than its factorization.

20638597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20638597 is about 4542.9722649385. The cubic root of 20638597 is about 274.3005785569.

The spelling of 20638597 in words is "twenty million, six hundred thirty-eight thousand, five hundred ninety-seven".