20451474 has 32 divisors (see below), whose sum is σ = 45901440. Its totient is φ = 6749136.

The previous prime is 20451463. The next prime is 20451511. The reversal of 20451474 is 47415402.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3724 + ... + 7400.

It is an arithmetic number, because the mean of its divisors is an integer number (1434420).

Almost surely, 2^20451474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20451474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22950720).

20451474 is an abundant number, since it is smaller than the sum of its proper divisors (25449966).

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

20451474 is a wasteful number, since it uses less digits than its factorization.

20451474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791 (or 3785 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 20451474 is about 4522.3305938421. The cubic root of 20451474 is about 273.4690643878.

Adding to 20451474 its reverse (47415402), we get a palindrome (67866876).

The spelling of 20451474 in words is "twenty million, four hundred fifty-one thousand, four hundred seventy-four".