20440523143455 has 32 divisors (see below), whose sum is σ = 33772034777088. Its totient is φ = 10546133990400.

The previous prime is 20440523143433. The next prime is 20440523143463. The reversal of 20440523143455 is 55434132504402.

It is not a de Polignac number, because 20440523143455 - 2¹² = 20440523139359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6656626 + ... + 9229935.

It is an arithmetic number, because the mean of its divisors is an integer number (1055376086784).

Almost surely, 2^{20440523143455} is an apocalyptic number.

20440523143455 is a deficient number, since it is larger than the sum of its proper divisors (13331511633633).

20440523143455 is a wasteful number, since it uses less digits than its factorization.

20440523143455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15889367.

The product of its (nonzero) digits is 1152000, while the sum is 42.

Adding to 20440523143455 its reverse (55434132504402), we get a palindrome (75874655647857).

The spelling of 20440523143455 in words is "twenty trillion, four hundred forty billion, five hundred twenty-three million, one hundred forty-three thousand, four hundred fifty-five".