20615797 has 8 divisors (see below), whose sum is σ = 21715776. Its totient is φ = 19532832.

The previous prime is 20615767. The next prime is 20615801. The reversal of 20615797 is 79751602.

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 20615797 - 2⁷ = 20615669 is a prime.

It is a super-2 number, since 2×20615797² = 850022171890418, 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 (20615767) 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 7 ways as a sum of consecutive naturals, for example, 1728 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (2714472).

Almost surely, 2^20615797 is an apocalyptic number.

It is an amenable number.

20615797 is a deficient number, since it is larger than the sum of its proper divisors (1099979).

20615797 is a wasteful number, since it uses less digits than its factorization.

20615797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8507.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 20615797 is about 4540.4622011421. The cubic root of 20615797 is about 274.1995323212.

It can be divided in two parts, 20615 and 797, that added together give a palindrome (21412).

The spelling of 20615797 in words is "twenty million, six hundred fifteen thousand, seven hundred ninety-seven".