20443042155 has 32 divisors (see below), whose sum is σ = 33553428480. Its totient is φ = 10622707200.

The previous prime is 20443042093. The next prime is 20443042159. The reversal of 20443042155 is 55124034402.

It is not a de Polignac number, because 20443042155 - 2¹² = 20443038059 is a prime.

It is a super-2 number, since 2×20443042155² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20443042159) 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, 219126 + ... + 298164.

It is an arithmetic number, because the mean of its divisors is an integer number (1048544640).

Almost surely, 2^20443042155 is an apocalyptic number.

20443042155 is a deficient number, since it is larger than the sum of its proper divisors (13110386325).

20443042155 is a wasteful number, since it uses less digits than its factorization.

20443042155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79491.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 20443042155 its reverse (55124034402), we get a palindrome (75567076557).

The spelling of 20443042155 in words is "twenty billion, four hundred forty-three million, forty-two thousand, one hundred fifty-five".