20451398 has 8 divisors (see below), whose sum is σ = 33465960. Its totient is φ = 9296080.

The previous prime is 20451397. The next prime is 20451407. The reversal of 20451398 is 89315402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464783 + ... + 464826.

It is an arithmetic number, because the mean of its divisors is an integer number (4183245).

Almost surely, 2^20451398 is an apocalyptic number.

20451398 is a deficient number, since it is larger than the sum of its proper divisors (13014562).

20451398 is a wasteful number, since it uses less digits than its factorization.

20451398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929622.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20451398 is about 4522.3221910872. The cubic root of 20451398 is about 273.4687256400.

It can be divided in two parts, 2045 and 1398, that added together give a palindrome (3443).

The spelling of 20451398 in words is "twenty million, four hundred fifty-one thousand, three hundred ninety-eight".