20533400355 has 64 divisors (see below), whose sum is σ = 35662620672. Its totient is φ = 10028551680.

The previous prime is 20533400353. The next prime is 20533400387. The reversal of 20533400355 is 55300433502.

It is not a de Polignac number, because 20533400355 - 2¹ = 20533400353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20533400353) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14954449 + ... + 14955821.

It is an arithmetic number, because the mean of its divisors is an integer number (557228448).

Almost surely, 2^20533400355 is an apocalyptic number.

20533400355 is a deficient number, since it is larger than the sum of its proper divisors (15129220317).

20533400355 is a wasteful number, since it uses less digits than its factorization.

20533400355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948.

The product of its (nonzero) digits is 27000, while the sum is 30.

Adding to 20533400355 its reverse (55300433502), we get a palindrome (75833833857).

The spelling of 20533400355 in words is "twenty billion, five hundred thirty-three million, four hundred thousand, three hundred fifty-five".