20611157145 has 16 divisors (see below), whose sum is σ = 32979960000. Its totient is φ = 10991914304.

The previous prime is 20611157101. The next prime is 20611157213. The reversal of 20611157145 is 54175111602.

It is a cyclic number.

It is not a de Polignac number, because 20611157145 - 2⁹ = 20611156633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271606 + ... + 339104.

It is an arithmetic number, because the mean of its divisors is an integer number (2061247500).

Almost surely, 2^20611157145 is an apocalyptic number.

It is an amenable number.

20611157145 is a deficient number, since it is larger than the sum of its proper divisors (12368802855).

20611157145 is a wasteful number, since it uses less digits than its factorization.

20611157145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87864.

The product of its (nonzero) digits is 8400, while the sum is 33.

Adding to 20611157145 its reverse (54175111602), we get a palindrome (74786268747).

The spelling of 20611157145 in words is "twenty billion, six hundred eleven million, one hundred fifty-seven thousand, one hundred forty-five".