20421276 has 24 divisors (see below), whose sum is σ = 50158080. Its totient is φ = 6448752.

The previous prime is 20421253. The next prime is 20421277. The reversal of 20421276 is 67212402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44556 + ... + 45011.

It is an arithmetic number, because the mean of its divisors is an integer number (2089920).

Almost surely, 2^20421276 is an apocalyptic number.

It is an amenable number.

20421276 is an abundant number, since it is smaller than the sum of its proper divisors (29736804).

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

20421276 is a wasteful number, since it uses less digits than its factorization.

20421276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89593 (or 89591 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20421276 is about 4518.9905952547. The cubic root of 20421276 is about 273.3343994935.

Adding to 20421276 its reverse (67212402), we get a palindrome (87633678).

The spelling of 20421276 in words is "twenty million, four hundred twenty-one thousand, two hundred seventy-six".