20804480 has 32 divisors (see below), whose sum is σ = 49737240. Its totient is φ = 8321536.

The previous prime is 20804479. The next prime is 20804501. The reversal of 20804480 is 8440802.

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, 15614 + ... + 16893.

Almost surely, 2^20804480 is an apocalyptic number.

20804480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20804480 is an abundant number, since it is smaller than the sum of its proper divisors (28932760).

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

20804480 is an equidigital number, since it uses as much as digits as its factorization.

20804480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32526 (or 32514 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 20804480 is about 4561.1928264435. The cubic root of 20804480 is about 275.0335165760.

The spelling of 20804480 in words is "twenty million, eight hundred four thousand, four hundred eighty".