20940015 has 8 divisors (see below), whose sum is σ = 33504048. Its totient is φ = 11168000.

The previous prime is 20939999. The next prime is 20940043. The reversal of 20940015 is 51004902.

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

It is not a de Polignac number, because 20940015 - 2⁴ = 20939999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20939973 and 20940000.

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, 697986 + ... + 698015.

It is an arithmetic number, because the mean of its divisors is an integer number (4188006).

Almost surely, 2^20940015 is an apocalyptic number.

20940015 is a deficient number, since it is larger than the sum of its proper divisors (12564033).

20940015 is a wasteful number, since it uses less digits than its factorization.

20940015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396009.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20940015 is about 4576.0261144360. The cubic root of 20940015 is about 275.6294781282.

Adding to 20940015 its reverse (51004902), we get a palindrome (71944917).

The spelling of 20940015 in words is "twenty million, nine hundred forty thousand, fifteen".