20438520153 has 32 divisors (see below), whose sum is σ = 30965068800. Its totient is φ = 11921507136.

The previous prime is 20438520143. The next prime is 20438520161. The reversal of 20438520153 is 35102583402.

It is not a de Polignac number, because 20438520153 - 2²¹ = 20436423001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20438520143) 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, 230775 + ... + 306812.

It is an arithmetic number, because the mean of its divisors is an integer number (967658400).

Almost surely, 2^20438520153 is an apocalyptic number.

20438520153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20438520153 is a deficient number, since it is larger than the sum of its proper divisors (10526548647).

20438520153 is a wasteful number, since it uses less digits than its factorization.

20438520153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537661.

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 20438520153 in words is "twenty billion, four hundred thirty-eight million, five hundred twenty thousand, one hundred fifty-three".