20611451355 has 32 divisors (see below), whose sum is σ = 38092612608. Its totient is φ = 9405580800.

The previous prime is 20611451353. The next prime is 20611451381. The reversal of 20611451355 is 55315411602.

It is not a de Polignac number, because 20611451355 - 2¹ = 20611451353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20611451353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3671251 + ... + 3676860.

It is an arithmetic number, because the mean of its divisors is an integer number (1190394144).

Almost surely, 2^20611451355 is an apocalyptic number.

20611451355 is a deficient number, since it is larger than the sum of its proper divisors (17481161253).

20611451355 is a wasteful number, since it uses less digits than its factorization.

20611451355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348147.

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 20611451355 its reverse (55315411602), we get a palindrome (75926862957).

The spelling of 20611451355 in words is "twenty billion, six hundred eleven million, four hundred fifty-one thousand, three hundred fifty-five".