20323195440 has 40 divisors (see below), whose sum is σ = 63001906608. Its totient is φ = 5419518720.

The previous prime is 20323195423. The next prime is 20323195469. The reversal of 20323195440 is 4459132302.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42339751 + ... + 42340230.

Almost surely, 2^20323195440 is an apocalyptic number.

20323195440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20323195440 is an abundant number, since it is smaller than the sum of its proper divisors (42678711168).

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

20323195440 is a wasteful number, since it uses less digits than its factorization.

20323195440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84679997 (or 84679991 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 20323195440 in words is "twenty billion, three hundred twenty-three million, one hundred ninety-five thousand, four hundred forty".