20940427 has 4 divisors (see below), whose sum is σ = 21386016. Its totient is φ = 20494840.

The previous prime is 20940421. The next prime is 20940449. The reversal of 20940427 is 72404902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20940427 - 2¹⁵ = 20907659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20940395 and 20940404.

It is not an unprimeable number, because it can be changed into a prime (20940421) 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, 222724 + ... + 222817.

It is an arithmetic number, because the mean of its divisors is an integer number (5346504).

Almost surely, 2^20940427 is an apocalyptic number.

20940427 is a deficient number, since it is larger than the sum of its proper divisors (445589).

20940427 is an equidigital number, since it uses as much as digits as its factorization.

20940427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445588.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20940427 is about 4576.0711314402. The cubic root of 20940427 is about 275.6312858092.

The spelling of 20940427 in words is "twenty million, nine hundred forty thousand, four hundred twenty-seven".