20672740 has 24 divisors (see below), whose sum is σ = 47359872. Its totient is φ = 7517280.

The previous prime is 20672683. The next prime is 20672747. The reversal of 20672740 is 4727602.

It is a junction number, because it is equal to n+sod(n) for n = 20672699 and 20672708.

It is not an unprimeable number, because it can be changed into a prime (20672747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46764 + ... + 47203.

It is an arithmetic number, because the mean of its divisors is an integer number (1973328).

Almost surely, 2^20672740 is an apocalyptic number.

20672740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20672740 is an abundant number, since it is smaller than the sum of its proper divisors (26687132).

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

20672740 is a wasteful number, since it uses less digits than its factorization.

20672740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93987 (or 93985 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20672740 is about 4546.7284942033. The cubic root of 20672740 is about 274.4517562249.

It can be divided in two parts, 20672 and 740, that added together give a palindrome (21412).

The spelling of 20672740 in words is "twenty million, six hundred seventy-two thousand, seven hundred forty".