20553243501 has 48 divisors (see below), whose sum is σ = 32877993984. Its totient is φ = 11380805856.

The previous prime is 20553243499. The next prime is 20553243527. The reversal of 20553243501 is 10534235502.

It is not a de Polignac number, because 20553243501 - 2¹ = 20553243499 is a prime.

It is a super-2 number, since 2×20553243501² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553243551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 789966 + ... + 815568.

It is an arithmetic number, because the mean of its divisors is an integer number (684958208).

Almost surely, 2^20553243501 is an apocalyptic number.

20553243501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20553243501 is a deficient number, since it is larger than the sum of its proper divisors (12324750483).

20553243501 is a wasteful number, since it uses less digits than its factorization.

20553243501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25790 (or 25783 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The spelling of 20553243501 in words is "twenty billion, five hundred fifty-three million, two hundred forty-three thousand, five hundred one".