20672615 has 16 divisors (see below), whose sum is σ = 25316928. Its totient is φ = 16202496.

The previous prime is 20672609. The next prime is 20672633. The reversal of 20672615 is 51627602.

It is a cyclic number.

It is not a de Polignac number, because 20672615 - 2¹² = 20668519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70409 + ... + 70701.

It is an arithmetic number, because the mean of its divisors is an integer number (1582308).

Almost surely, 2^20672615 is an apocalyptic number.

20672615 is a deficient number, since it is larger than the sum of its proper divisors (4644313).

20672615 is a wasteful number, since it uses less digits than its factorization.

20672615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20672615 is about 4546.7147480351. The cubic root of 20672615 is about 274.4512030562.

The spelling of 20672615 in words is "twenty million, six hundred seventy-two thousand, six hundred fifteen".