202015640 has 32 divisors (see below), whose sum is σ = 460296000. Its totient is φ = 79782144.

The previous prime is 202015631. The next prime is 202015643. The reversal of 202015640 is 46510202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202015643) 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, 28805 + ... + 35124.

It is an arithmetic number, because the mean of its divisors is an integer number (14384250).

Almost surely, 2^202015640 is an apocalyptic number.

202015640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202015640 is an abundant number, since it is smaller than the sum of its proper divisors (258280360).

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

202015640 is a wasteful number, since it uses less digits than its factorization.

202015640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64019 (or 64015 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 202015640 is about 14213.2206061821. The cubic root of 202015640 is about 586.7615735462.

Adding to 202015640 its reverse (46510202), we get a palindrome (248525842).

The spelling of 202015640 in words is "two hundred two million, fifteen thousand, six hundred forty".