20261172153345 has 64 divisors (see below), whose sum is σ = 35226353909760. Its totient is φ = 9906569568000.

The previous prime is 20261172153337. The next prime is 20261172153359. The reversal of 20261172153345 is 54335127116202.

It is not a de Polignac number, because 20261172153345 - 2³ = 20261172153337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20261172153297 and 20261172153306.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 349898895 + ... + 349956795.

It is an arithmetic number, because the mean of its divisors is an integer number (550411779840).

Almost surely, 2^{20261172153345} is an apocalyptic number.

It is an amenable number.

20261172153345 is a deficient number, since it is larger than the sum of its proper divisors (14965181756415).

20261172153345 is a wasteful number, since it uses less digits than its factorization.

20261172153345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97566.

The product of its (nonzero) digits is 302400, while the sum is 42.

Adding to 20261172153345 its reverse (54335127116202), we get a palindrome (74596299269547).

The spelling of 20261172153345 in words is "twenty trillion, two hundred sixty-one billion, one hundred seventy-two million, one hundred fifty-three thousand, three hundred forty-five".