20835757440 has 128 divisors (see below), whose sum is σ = 73793368800. Its totient is φ = 5556197376.

The previous prime is 20835757403. The next prime is 20835757441. The reversal of 20835757440 is 4475753802.

20835757440 is a `hidden beast` number, since 2 + 0 + 8 + 3 + 575 + 74 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835757441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585607 + ... + 620166.

Almost surely, 2^20835757440 is an apocalyptic number.

20835757440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20835757440 is an abundant number, since it is smaller than the sum of its proper divisors (52957611360).

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

20835757440 is a wasteful number, since it uses less digits than its factorization.

20835757440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205801 (or 1205783 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 45.

The spelling of 20835757440 in words is "twenty billion, eight hundred thirty-five million, seven hundred fifty-seven thousand, four hundred forty".