20453633064 has 24 divisors (see below), whose sum is σ = 55395256410. Its totient is φ = 6817877664.

The previous prime is 20453633063. The next prime is 20453633071. The reversal of 20453633064 is 46033635402.

20453633064 is a `hidden beast` number, since 204 + 5 + 363 + 30 + 64 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10880576100 + 9573056964 = 104310^2 + 97842^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×20453633064² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20453633063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142039047 + ... + 142039190.

Almost surely, 2^20453633064 is an apocalyptic number.

20453633064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20453633064 is an abundant number, since it is smaller than the sum of its proper divisors (34941623346).

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

20453633064 is a wasteful number, since it uses less digits than its factorization.

20453633064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284078249 (or 284078242 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 36.

The spelling of 20453633064 in words is "twenty billion, four hundred fifty-three million, six hundred thirty-three thousand, sixty-four".