20620815 has 8 divisors (see below), whose sum is σ = 32993328. Its totient is φ = 10997760.

The previous prime is 20620807. The next prime is 20620823. The reversal of 20620815 is 51802602.

It is an interprime number because it is at equal distance from previous prime (20620807) and next prime (20620823).

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

It is not a de Polignac number, because 20620815 - 2³ = 20620807 is a prime.

It is a super-2 number, since 2×20620815² = 850436022528450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 687346 + ... + 687375.

It is an arithmetic number, because the mean of its divisors is an integer number (4124166).

Almost surely, 2^20620815 is an apocalyptic number.

20620815 is a deficient number, since it is larger than the sum of its proper divisors (12372513).

20620815 is a wasteful number, since it uses less digits than its factorization.

20620815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374729.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20620815 is about 4541.0147544354. The cubic root of 20620815 is about 274.2217777484.

The spelling of 20620815 in words is "twenty million, six hundred twenty thousand, eight hundred fifteen".