20451464 has 32 divisors (see below), whose sum is σ = 42033600. Its totient is φ = 9251520.

The previous prime is 20451463. The next prime is 20451511. The reversal of 20451464 is 46415402.

It is not an unprimeable number, because it can be changed into a prime (20451463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23957 + ... + 24795.

It is an arithmetic number, because the mean of its divisors is an integer number (1313550).

Almost surely, 2^20451464 is an apocalyptic number.

It is an amenable number.

20451464 is an abundant number, since it is smaller than the sum of its proper divisors (21582136).

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

20451464 is a wasteful number, since it uses less digits than its factorization.

20451464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 20451464 is about 4522.3294882173. The cubic root of 20451464 is about 273.4690198157.

Adding to 20451464 its reverse (46415402), we get a palindrome (66866866).

The spelling of 20451464 in words is "twenty million, four hundred fifty-one thousand, four hundred sixty-four".