20909427 has 48 divisors (see below), whose sum is σ = 36093312. Its totient is φ = 10644480.

The previous prime is 20909419. The next prime is 20909431. The reversal of 20909427 is 72490902.

It is not a de Polignac number, because 20909427 - 2³ = 20909419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20909027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108243 + ... + 108435.

It is an arithmetic number, because the mean of its divisors is an integer number (751944).

Almost surely, 2^20909427 is an apocalyptic number.

20909427 is a deficient number, since it is larger than the sum of its proper divisors (15183885).

20909427 is a wasteful number, since it uses less digits than its factorization.

20909427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20909427 is about 4572.6826918123. The cubic root of 20909427 is about 275.4952046974.

The spelling of 20909427 in words is "twenty million, nine hundred nine thousand, four hundred twenty-seven".