20451372 has 36 divisors (see below), whose sum is σ = 50374296. Its totient is φ = 6456960.

The previous prime is 20451329. The next prime is 20451373. The reversal of 20451372 is 27315402.

It is not an unprimeable number, because it can be changed into a prime (20451373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1972 + ... + 6692.

It is an arithmetic number, because the mean of its divisors is an integer number (1399286).

Almost surely, 2^20451372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20451372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25187148).

20451372 is an abundant number, since it is smaller than the sum of its proper divisors (29922924).

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

20451372 is a wasteful number, since it uses less digits than its factorization.

20451372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4766 (or 4745 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20451372 is about 4522.3193164570. The cubic root of 20451372 is about 273.4686097524.

Adding to 20451372 its reverse (27315402), we get a palindrome (47766774).

The spelling of 20451372 in words is "twenty million, four hundred fifty-one thousand, three hundred seventy-two".