20553331455 has 48 divisors (see below), whose sum is σ = 36097719840. Its totient is φ = 10817224704.

The previous prime is 20553331439. The next prime is 20553331573. The reversal of 20553331455 is 55413335502.

20553331455 is a `hidden beast` number, since 20 + 553 + 3 + 31 + 4 + 55 = 666.

It is not a de Polignac number, because 20553331455 - 2⁴ = 20553331439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1534176 + ... + 1547514.

It is an arithmetic number, because the mean of its divisors is an integer number (752035830).

Almost surely, 2^20553331455 is an apocalyptic number.

20553331455 is a deficient number, since it is larger than the sum of its proper divisors (15544388385).

20553331455 is a wasteful number, since it uses less digits than its factorization.

20553331455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13800 (or 13797 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 36.

Adding to 20553331455 its reverse (55413335502), we get a palindrome (75966666957).

The spelling of 20553331455 in words is "twenty billion, five hundred fifty-three million, three hundred thirty-one thousand, four hundred fifty-five".