20641368 has 64 divisors (see below), whose sum is σ = 57697920. Its totient is φ = 6099200.

The previous prime is 20641351. The next prime is 20641393. The reversal of 20641368 is 86314602.

It is a super-2 number, since 2×20641368² = 852132145822848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9871 + ... + 11777.

It is an arithmetic number, because the mean of its divisors is an integer number (901530).

Almost surely, 2^20641368 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 20641368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28848960).

20641368 is an abundant number, since it is smaller than the sum of its proper divisors (37056552).

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

20641368 is a wasteful number, since it uses less digits than its factorization.

20641368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20641368 is about 4543.2772312506. The cubic root of 20641368 is about 274.3128541473.

The spelling of 20641368 in words is "twenty million, six hundred forty-one thousand, three hundred sixty-eight".