20655401533 has 4 divisors (see below), whose sum is σ = 22244278588. Its totient is φ = 19066524480.

The previous prime is 20655401491. The next prime is 20655401549. The reversal of 20655401533 is 33510455602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7416137689 + 13239263844 = 86117^2 + 115062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20655401533 is a prime.

It is a super-2 number, since 2×20655401533² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655401593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794438508 + ... + 794438533.

It is an arithmetic number, because the mean of its divisors is an integer number (5561069647).

Almost surely, 2^20655401533 is an apocalyptic number.

It is an amenable number.

20655401533 is a deficient number, since it is larger than the sum of its proper divisors (1588877055).

20655401533 is a wasteful number, since it uses less digits than its factorization.

20655401533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588877054.

The product of its (nonzero) digits is 54000, while the sum is 34.

The spelling of 20655401533 in words is "twenty billion, six hundred fifty-five million, four hundred one thousand, five hundred thirty-three".