20673920 has 32 divisors (see below), whose sum is σ = 49425120. Its totient is φ = 8269312.

The previous prime is 20673907. The next prime is 20673943. The reversal of 20673920 is 2937602.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15512 + ... + 16791.

It is an arithmetic number, because the mean of its divisors is an integer number (1544535).

Almost surely, 2^20673920 is an apocalyptic number.

20673920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20673920 is an abundant number, since it is smaller than the sum of its proper divisors (28751200).

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

20673920 is an equidigital number, since it uses as much as digits as its factorization.

20673920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32322 (or 32310 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20673920 is about 4546.8582559829. The cubic root of 20673920 is about 274.4569780276.

The spelling of 20673920 in words is "twenty million, six hundred seventy-three thousand, nine hundred twenty".