20705427 has 24 divisors (see below), whose sum is σ = 31549440. Its totient is φ = 13065840.

The previous prime is 20705423. The next prime is 20705453. The reversal of 20705427 is 72450702.

It is not a de Polignac number, because 20705427 - 2² = 20705423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20705427.

It is not an unprimeable number, because it can be changed into a prime (20705423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12324 + ... + 13902.

It is an arithmetic number, because the mean of its divisors is an integer number (1314560).

Almost surely, 2^20705427 is an apocalyptic number.

20705427 is a deficient number, since it is larger than the sum of its proper divisors (10844013).

20705427 is a wasteful number, since it uses less digits than its factorization.

20705427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 20705427 is about 4550.3216369835. The cubic root of 20705427 is about 274.5963311658.

The spelling of 20705427 in words is "twenty million, seven hundred five thousand, four hundred twenty-seven".