20799571440 has 40 divisors (see below), whose sum is σ = 64478672208. Its totient is φ = 5546552320.

The previous prime is 20799571433. The next prime is 20799571459. The reversal of 20799571440 is 4417599702.

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

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20799571440.

It is a congruent number.

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, 43332201 + ... + 43332680.

Almost surely, 2^20799571440 is an apocalyptic number.

20799571440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20799571440 is an abundant number, since it is smaller than the sum of its proper divisors (43679100768).

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

20799571440 is a wasteful number, since it uses less digits than its factorization.

20799571440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86664897 (or 86664891 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 20799571440 in words is "twenty billion, seven hundred ninety-nine million, five hundred seventy-one thousand, four hundred forty".