20735562440 has 16 divisors (see below), whose sum is σ = 46655015580. Its totient is φ = 8294224960.

The previous prime is 20735562437. The next prime is 20735562461. The reversal of 20735562440 is 4426553702.

It can be written as a sum of positive squares in 2 ways, for example, as 20265800164 + 469762276 = 142358^2 + 21674^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20735562394 and 20735562403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259194491 + ... + 259194570.

Almost surely, 2^20735562440 is an apocalyptic number.

20735562440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20735562440 is an abundant number, since it is smaller than the sum of its proper divisors (25919453140).

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

20735562440 is a wasteful number, since it uses less digits than its factorization.

20735562440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518389072 (or 518389068 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 38.

The spelling of 20735562440 in words is "twenty billion, seven hundred thirty-five million, five hundred sixty-two thousand, four hundred forty".