20542615 has 8 divisors (see below), whose sum is σ = 25446528. Its totient is φ = 15903840.

The previous prime is 20542603. The next prime is 20542633. The reversal of 20542615 is 51624502.

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

It is a de Polignac number, because none of the positive numbers 2^k-20542615 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20542615.

It is a congruent number.

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, 66112 + ... + 66421.

It is an arithmetic number, because the mean of its divisors is an integer number (3180816).

Almost surely, 2^20542615 is an apocalyptic number.

20542615 is a deficient number, since it is larger than the sum of its proper divisors (4903913).

20542615 is a wasteful number, since it uses less digits than its factorization.

20542615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132569.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20542615 is about 4532.3961653854. The cubic root of 20542615 is about 273.8746962888.

The spelling of 20542615 in words is "twenty million, five hundred forty-two thousand, six hundred fifteen".