20224464640 has 36 divisors (see below), whose sum is σ = 48443916024. Its totient is φ = 8089785344.

The previous prime is 20224464593. The next prime is 20224464643. The reversal of 20224464640 is 4646442202.

It is a super-2 number, since 2×20224464640² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20224464596 and 20224464605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20224464643) 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, 7898902 + ... + 7901461.

It is an arithmetic number, because the mean of its divisors is an integer number (1345664334).

Almost surely, 2^20224464640 is an apocalyptic number.

20224464640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20224464640 is an abundant number, since it is smaller than the sum of its proper divisors (28219451384).

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

20224464640 is an equidigital number, since it uses as much as digits as its factorization.

20224464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15800384 (or 15800370 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

The spelling of 20224464640 in words is "twenty billion, two hundred twenty-four million, four hundred sixty-four thousand, six hundred forty".