20255366340 has 144 divisors (see below), whose sum is σ = 67509973440. Its totient is φ = 4874999040.

The previous prime is 20255366291. The next prime is 20255366353. The reversal of 20255366340 is 4366355202.

20255366340 is a `hidden beast` number, since 2 + 0 + 2 + 553 + 6 + 63 + 40 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20255366295 and 20255366304.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 238422 + ... + 312018.

It is an arithmetic number, because the mean of its divisors is an integer number (468819260).

Almost surely, 2^20255366340 is an apocalyptic number.

20255366340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20255366340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33754986720).

20255366340 is an abundant number, since it is smaller than the sum of its proper divisors (47254607100).

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

20255366340 is a wasteful number, since it uses less digits than its factorization.

20255366340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73762 (or 73757 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The spelling of 20255366340 in words is "twenty billion, two hundred fifty-five million, three hundred sixty-six thousand, three hundred forty".