39645020 has 72 divisors (see below), whose sum is σ = 93352560. Its totient is φ = 14139648.

The previous prime is 39645013. The next prime is 39645029. The reversal of 39645020 is 2054693.

It is a super-2 number, since 2×39645020² = 3143455221600800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39645029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2086571 + ... + 2086589.

Almost surely, 2^39645020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39645020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46676280).

39645020 is an abundant number, since it is smaller than the sum of its proper divisors (53707540).

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

39645020 is a wasteful number, since it uses less digits than its factorization.

39645020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 39645020 is about 6296.4291467466. The cubic root of 39645020 is about 340.9805030089.

The spelling of 39645020 in words is "thirty-nine million, six hundred forty-five thousand, twenty".