20074640 has 80 divisors (see below), whose sum is σ = 50353920. Its totient is φ = 7418880.

The previous prime is 20074619. The next prime is 20074643. The reversal of 20074640 is 4647002.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×20074640² = 805982342259200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20074643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71300 + ... + 71580.

It is an arithmetic number, because the mean of its divisors is an integer number (629424).

Almost surely, 2^20074640 is an apocalyptic number.

20074640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20074640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25176960).

20074640 is an abundant number, since it is smaller than the sum of its proper divisors (30279280).

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

20074640 is a wasteful number, since it uses less digits than its factorization.

20074640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20074640 is about 4480.4731892960. The cubic root of 20074640 is about 271.7790160139.

The spelling of 20074640 in words is "twenty million, seventy-four thousand, six hundred forty".