20854391532 has 96 divisors (see below), whose sum is σ = 53111020032. Its totient is φ = 6330671616.

The previous prime is 20854391501. The next prime is 20854391533. The reversal of 20854391532 is 23519345802.

It is not an unprimeable number, because it can be changed into a prime (20854391533) 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, 3566203 + ... + 3572045.

It is an arithmetic number, because the mean of its divisors is an integer number (553239792).

Almost surely, 2^20854391532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20854391532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26555510016).

20854391532 is an abundant number, since it is smaller than the sum of its proper divisors (32256628500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20854391532 is a wasteful number, since it uses less digits than its factorization.

20854391532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6167 (or 6165 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 20854391532 in words is "twenty billion, eight hundred fifty-four million, three hundred ninety-one thousand, five hundred thirty-two".