20674640 has 40 divisors (see below), whose sum is σ = 54936960. Its totient is φ = 7088256.

The previous prime is 20674627. The next prime is 20674649. The reversal of 20674640 is 4647602.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20674649) 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, 17900 + ... + 19019.

It is an arithmetic number, because the mean of its divisors is an integer number (1373424).

Almost surely, 2^20674640 is an apocalyptic number.

20674640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20674640 is an abundant number, since it is smaller than the sum of its proper divisors (34262320).

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

20674640 is a wasteful number, since it uses less digits than its factorization.

20674640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36939 (or 36933 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 20674640 is about 4546.9374308429. The cubic root of 20674640 is about 274.4601641147.

The spelling of 20674640 in words is "twenty million, six hundred seventy-four thousand, six hundred forty".