20532445521 has 64 divisors (see below), whose sum is σ = 34298339328. Its totient is φ = 10659022848.

The previous prime is 20532445511. The next prime is 20532445523. The reversal of 20532445521 is 12554423502.

It is a happy number.

It is not a de Polignac number, because 20532445521 - 2⁵ = 20532445489 is a prime.

It is a super-2 number, since 2×20532445521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20532445523) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1216486 + ... + 1233248.

It is an arithmetic number, because the mean of its divisors is an integer number (535911552).

Almost surely, 2^20532445521 is an apocalyptic number.

20532445521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20532445521 is a deficient number, since it is larger than the sum of its proper divisors (13765893807).

20532445521 is a wasteful number, since it uses less digits than its factorization.

20532445521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16910.

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 20532445521 in words is "twenty billion, five hundred thirty-two million, four hundred forty-five thousand, five hundred twenty-one".