20767985 has 16 divisors (see below), whose sum is σ = 29402112. Its totient is φ = 13780800.

The previous prime is 20767963. The next prime is 20768009. The reversal of 20767985 is 58976702.

It is not a de Polignac number, because 20767985 - 2¹⁶ = 20702449 is a prime.

It is a Duffinian number.

It is a Curzon 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, 8486 + ... + 10655.

It is an arithmetic number, because the mean of its divisors is an integer number (1837632).

Almost surely, 2^20767985 is an apocalyptic number.

It is an amenable number.

20767985 is a deficient number, since it is larger than the sum of its proper divisors (8634127).

20767985 is a wasteful number, since it uses less digits than its factorization.

20767985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19184.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 20767985 is about 4557.1904722098. The cubic root of 20767985 is about 274.8726021472.

The spelling of 20767985 in words is "twenty million, seven hundred sixty-seven thousand, nine hundred eighty-five".