20135513444 has 24 divisors (see below), whose sum is σ = 36777674808. Its totient is φ = 9636872960.

The previous prime is 20135513441. The next prime is 20135513467. The reversal of 20135513444 is 44431553102.

It can be written as a sum of positive squares in 4 ways, for example, as 831745600 + 19303767844 = 28840^2 + 138938^2 .

It is a super-2 number, since 2×20135513444² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20135513444.

It is not an unprimeable number, because it can be changed into a prime (20135513441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1149587 + ... + 1166970.

It is an arithmetic number, because the mean of its divisors is an integer number (1532403117).

Almost surely, 2^20135513444 is an apocalyptic number.

It is an amenable number.

20135513444 is a deficient number, since it is larger than the sum of its proper divisors (16642161364).

20135513444 is a wasteful number, since it uses less digits than its factorization.

20135513444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316655 (or 2316653 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 20135513444 in words is "twenty billion, one hundred thirty-five million, five hundred thirteen thousand, four hundred forty-four".