20427284 has 6 divisors (see below), whose sum is σ = 35747754. Its totient is φ = 10213640.

The previous prime is 20427283. The next prime is 20427287. The reversal of 20427284 is 48272402.

It can be written as a sum of positive squares in only one way, i.e., 16224784 + 4202500 = 4028^2 + 2050^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2553407 + ... + 2553414.

It is an arithmetic number, because the mean of its divisors is an integer number (5957959).

Almost surely, 2^20427284 is an apocalyptic number.

It is an amenable number.

20427284 is a deficient number, since it is larger than the sum of its proper divisors (15320470).

20427284 is a wasteful number, since it uses less digits than its factorization.

20427284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106825 (or 5106823 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20427284 is about 4519.6552965907. The cubic root of 20427284 is about 273.3612021290.

Adding to 20427284 its reverse (48272402), we get a palindrome (68699686).

The spelling of 20427284 in words is "twenty million, four hundred twenty-seven thousand, two hundred eighty-four".