20047138155450 has 384 divisors, whose sum is σ = 65390814720000. Its totient is φ = 4418691782400.

The previous prime is 20047138155433. The next prime is 20047138155469. The reversal of 20047138155450 is 5455183174002.

20047138155450 is a `hidden beast` number, since 2 + 0 + 0 + 4 + 7 + 13 + 81 + 554 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 20047138155396 and 20047138155405.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 222209451 + ... + 222299649.

It is an arithmetic number, because the mean of its divisors is an integer number (170288580000).

Almost surely, 2^{20047138155450} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20047138155450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32695407360000).

20047138155450 is an abundant number, since it is smaller than the sum of its proper divisors (45343676564550).

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

20047138155450 is a wasteful number, since it uses less digits than its factorization.

20047138155450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91067 (or 91056 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 20047138155450 in words is "twenty trillion, forty-seven billion, one hundred thirty-eight million, one hundred fifty-five thousand, four hundred fifty".