20321442 has 20 divisors (see below), whose sum is σ = 45535446. Its totient is φ = 6773760.

The previous prime is 20321423. The next prime is 20321447. The reversal of 20321442 is 24412302.

20321442 is a `hidden beast` number, since 203 + 21 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19527561 + 793881 = 4419^2 + 891^2 .

It is a super-2 number, since 2×20321442² = 825922009918728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321447) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62559 + ... + 62882.

Almost surely, 2^20321442 is an apocalyptic number.

20321442 is an abundant number, since it is smaller than the sum of its proper divisors (25214004).

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

20321442 is a wasteful number, since it uses less digits than its factorization.

20321442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125455 (or 125446 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20321442 is about 4507.9310110072. The cubic root of 20321442 is about 272.8882527794. Note that the first 3 decimals are identical.

Adding to 20321442 its reverse (24412302), we get a palindrome (44733744).

The spelling of 20321442 in words is "twenty million, three hundred twenty-one thousand, four hundred forty-two".