20135040 has 64 divisors (see below), whose sum is σ = 64186560. Its totient is φ = 5368832.

The previous prime is 20135039. The next prime is 20135047. The reversal of 20135040 is 4053102.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20135047) 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, 3324 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (1002915).

Almost surely, 2^20135040 is an apocalyptic number.

20135040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20135040 is an abundant number, since it is smaller than the sum of its proper divisors (44051520).

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

20135040 is a wasteful number, since it uses less digits than its factorization.

20135040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10509 (or 10497 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20135040 is about 4487.2084863532. The cubic root of 20135040 is about 272.0513167307.

Adding to 20135040 its reverse (4053102), we get a palindrome (24188142).

The spelling of 20135040 in words is "twenty million, one hundred thirty-five thousand, forty".