20342991456 has 192 divisors, whose sum is σ = 61803000000. Its totient is φ = 6502035456.

The previous prime is 20342991407. The next prime is 20342991467. The reversal of 20342991456 is 65419924302.

20342991456 is a `hidden beast` number, since 203 + 429 + 9 + 14 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3730620 + ... + 3736068.

It is an arithmetic number, because the mean of its divisors is an integer number (321890625).

Almost surely, 2^20342991456 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 20342991456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30901500000).

20342991456 is an abundant number, since it is smaller than the sum of its proper divisors (41460008544).

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

20342991456 is a wasteful number, since it uses less digits than its factorization.

20342991456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5646 (or 5632 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 20342991456 in words is "twenty billion, three hundred forty-two million, nine hundred ninety-one thousand, four hundred fifty-six".