53209820 has 24 divisors (see below), whose sum is σ = 111888000. Its totient is φ = 21255872.

The previous prime is 53209817. The next prime is 53209901. The reversal of 53209820 is 2890235.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20981 + ... + 23379.

It is an arithmetic number, because the mean of its divisors is an integer number (4662000).

Almost surely, 2^53209820 is an apocalyptic number.

It is an amenable number.

53209820 is an abundant number, since it is smaller than the sum of its proper divisors (58678180).

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

53209820 is a wasteful number, since it uses less digits than its factorization.

53209820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517 (or 3515 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 53209820 is about 7294.5061518927. The cubic root of 53209820 is about 376.1236107088.

The spelling of 53209820 in words is "fifty-three million, two hundred nine thousand, eight hundred twenty".