20773923840 has 528 divisors, whose sum is σ = 79597971648. Its totient is φ = 4982833152.

The previous prime is 20773923791. The next prime is 20773923851. The reversal of 20773923840 is 4832937702.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18016704 + ... + 18017856.

Almost surely, 2^20773923840 is an apocalyptic number.

20773923840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20773923840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39798985824).

20773923840 is an abundant number, since it is smaller than the sum of its proper divisors (58824047808).

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

20773923840 is a wasteful number, since it uses less digits than its factorization.

20773923840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20773923840 in words is "twenty billion, seven hundred seventy-three million, nine hundred twenty-three thousand, eight hundred forty".