20451442 has 32 divisors (see below), whose sum is σ = 35769600. Its totient is φ = 8666880.

The previous prime is 20451437. The next prime is 20451443. The reversal of 20451442 is 24415402.

It is a happy number.

It is a super-2 number, since 2×20451442² = 836522959758728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20451443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55543 + ... + 55909.

It is an arithmetic number, because the mean of its divisors is an integer number (1117800).

Almost surely, 2^20451442 is an apocalyptic number.

20451442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20451442 is a deficient number, since it is larger than the sum of its proper divisors (15318158).

20451442 is a wasteful number, since it uses less digits than its factorization.

20451442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 20451442 is about 4522.3270558419. The cubic root of 20451442 is about 273.4689217572.

Adding to 20451442 its reverse (24415402), we get a palindrome (44866844).

The spelling of 20451442 in words is "twenty million, four hundred fifty-one thousand, four hundred forty-two".