21473020 has 12 divisors (see below), whose sum is σ = 45093384. Its totient is φ = 8589200.

The previous prime is 21473017. The next prime is 21473029. The reversal of 21473020 is 2037412.

It is a super-2 number, since 2×21473020² = 922181175840800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536806 + ... + 536845.

It is an arithmetic number, because the mean of its divisors is an integer number (3757782).

Almost surely, 2^21473020 is an apocalyptic number.

21473020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21473020 is an abundant number, since it is smaller than the sum of its proper divisors (23620364).

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

21473020 is a wasteful number, since it uses less digits than its factorization.

21473020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073660 (or 1073658 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21473020 is about 4633.8990062365. The cubic root of 21473020 is about 277.9485266051.

The spelling of 21473020 in words is "twenty-one million, four hundred seventy-three thousand, twenty".