20401215530355 has 96 divisors (see below), whose sum is σ = 40571062272000. Its totient is φ = 9386933149440.

The previous prime is 20401215530237. The next prime is 20401215530411. The reversal of 20401215530355 is 55303551210402.

20401215530355 is a `hidden beast` number, since 2 + 0 + 40 + 1 + 215 + 53 + 0 + 355 = 666.

It is not a de Polignac number, because 20401215530355 - 2⁹ = 20401215529843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5608980 + ... + 8500769.

It is an arithmetic number, because the mean of its divisors is an integer number (422615232000).

Almost surely, 2^{20401215530355} is an apocalyptic number.

20401215530355 is a deficient number, since it is larger than the sum of its proper divisors (20169846741645).

20401215530355 is a wasteful number, since it uses less digits than its factorization.

20401215530355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14109921 (or 14109918 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 20401215530355 its reverse (55303551210402), we get a palindrome (75704766740757).

The spelling of 20401215530355 in words is "twenty trillion, four hundred one billion, two hundred fifteen million, five hundred thirty thousand, three hundred fifty-five".