20985427 has 8 divisors (see below), whose sum is σ = 21220352. Its totient is φ = 20752200.

The previous prime is 20985421. The next prime is 20985439. The reversal of 20985427 is 72458902.

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

It is a cyclic number.

It is not a de Polignac number, because 20985427 - 2¹⁹ = 20461139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20985421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56998 + ... + 57364.

It is an arithmetic number, because the mean of its divisors is an integer number (2652544).

Almost surely, 2^20985427 is an apocalyptic number.

20985427 is a deficient number, since it is larger than the sum of its proper divisors (234925).

20985427 is a wasteful number, since it uses less digits than its factorization.

20985427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20985427 is about 4580.9853743491. The cubic root of 20985427 is about 275.8285841367.

It can be divided in two parts, 20985 and 427, that added together give a palindrome (21412).

The spelling of 20985427 in words is "twenty million, nine hundred eighty-five thousand, four hundred twenty-seven".