20439270 has 128 divisors (see below), whose sum is σ = 59460480. Its totient is φ = 4976640.

The previous prime is 20439257. The next prime is 20439277. The reversal of 20439270 is 7293402.

20439270 is a `hidden beast` number, since 204 + 392 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20439277) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 279954 + ... + 280026.

It is an arithmetic number, because the mean of its divisors is an integer number (464535).

Almost surely, 2^20439270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20439270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29730240).

20439270 is an abundant number, since it is smaller than the sum of its proper divisors (39021210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20439270 is a wasteful number, since it uses less digits than its factorization.

20439270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20439270 is about 4520.9810882153. The cubic root of 20439270 is about 273.4146578688.

The spelling of 20439270 in words is "twenty million, four hundred thirty-nine thousand, two hundred seventy".