20288321408 has 16 divisors (see below), whose sum is σ = 40418140560. Its totient is φ = 10144160640.

The previous prime is 20288321399. The next prime is 20288321461. The reversal of 20288321408 is 80412388202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×20288321408² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79251128 + ... + 79251383.

It is an arithmetic number, because the mean of its divisors is an integer number (2526133785).

Almost surely, 2^20288321408 is an apocalyptic number.

It is an amenable number.

20288321408 is a deficient number, since it is larger than the sum of its proper divisors (20129819152).

20288321408 is an equidigital number, since it uses as much as digits as its factorization.

20288321408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158502525 (or 158502513 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The spelling of 20288321408 in words is "twenty billion, two hundred eighty-eight million, three hundred twenty-one thousand, four hundred eight".