20066615 has 4 divisors (see below), whose sum is σ = 24079944. Its totient is φ = 16053288.

The previous prime is 20066611. The next prime is 20066623. The reversal of 20066615 is 51666002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51666002 = 2 ⋅25833001.

It is a cyclic number.

It is not a de Polignac number, because 20066615 - 2² = 20066611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20066611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006657 + ... + 2006666.

It is an arithmetic number, because the mean of its divisors is an integer number (6019986).

Almost surely, 2^20066615 is an apocalyptic number.

20066615 is a deficient number, since it is larger than the sum of its proper divisors (4013329).

20066615 is an equidigital number, since it uses as much as digits as its factorization.

20066615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013328.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20066615 is about 4479.5775470461. The cubic root of 20066615 is about 271.7427958991.

The spelling of 20066615 in words is "twenty million, sixty-six thousand, six hundred fifteen".