20451332 has 12 divisors (see below), whose sum is σ = 39043536. Its totient is φ = 9296040.

The previous prime is 20451329. The next prime is 20451373. The reversal of 20451332 is 23315402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232358 + ... + 232445.

It is an arithmetic number, because the mean of its divisors is an integer number (3253628).

Almost surely, 2^20451332 is an apocalyptic number.

20451332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20451332 is a deficient number, since it is larger than the sum of its proper divisors (18592204).

20451332 is a wasteful number, since it uses less digits than its factorization.

20451332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464818 (or 464816 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20451332 is about 4522.3148939454. The cubic root of 20451332 is about 273.4684314636.

Adding to 20451332 its reverse (23315402), we get a palindrome (43766734).

The spelling of 20451332 in words is "twenty million, four hundred fifty-one thousand, three hundred thirty-two".