20071540 has 24 divisors (see below), whose sum is σ = 43132320. Its totient is φ = 7841568.

The previous prime is 20071529. The next prime is 20071553. The reversal of 20071540 is 4517002.

It is a super-3 number, since 3×20071540³ (a number of 23 digits) contains 333 as substring.

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, 10810 + ... + 12529.

It is an arithmetic number, because the mean of its divisors is an integer number (1797180).

Almost surely, 2^20071540 is an apocalyptic number.

20071540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20071540 is an abundant number, since it is smaller than the sum of its proper divisors (23060780).

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

20071540 is a wasteful number, since it uses less digits than its factorization.

20071540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23391 (or 23389 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20071540 is about 4480.1272303362. The cubic root of 20071540 is about 271.7650255875.

Adding to 20071540 its reverse (4517002), we get a palindrome (24588542).

The spelling of 20071540 in words is "twenty million, seventy-one thousand, five hundred forty".