20613715 has 8 divisors (see below), whose sum is σ = 25156080. Its totient is φ = 16211232.

The previous prime is 20613647. The next prime is 20613731. The reversal of 20613715 is 51731602.

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 20613715 - 2⁷ = 20613587 is a prime.

It is a super-2 number, since 2×20613715² = 849850492202450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20613715.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34644 + ... + 35233.

It is an arithmetic number, because the mean of its divisors is an integer number (3144510).

Almost surely, 2^20613715 is an apocalyptic number.

20613715 is a deficient number, since it is larger than the sum of its proper divisors (4542365).

20613715 is an equidigital number, since it uses as much as digits as its factorization.

20613715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69941.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20613715 is about 4540.2329235404. The cubic root of 20613715 is about 274.1903014930.

It can be divided in two parts, 2061 and 3715, that added together give a square (5776 = 76²).

The spelling of 20613715 in words is "twenty million, six hundred thirteen thousand, seven hundred fifteen".