213020520 has 32 divisors (see below), whose sum is σ = 639061920. Its totient is φ = 56805440.

The previous prime is 213020491. The next prime is 213020531. The reversal of 213020520 is 25020312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 213020520.

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, 887466 + ... + 887705.

It is an arithmetic number, because the mean of its divisors is an integer number (19970685).

Almost surely, 2^213020520 is an apocalyptic number.

213020520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213020520 is an abundant number, since it is smaller than the sum of its proper divisors (426041400).

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

213020520 is a wasteful number, since it uses less digits than its factorization.

213020520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775185 (or 1775181 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 213020520 is about 14595.2225060120. Note that the first 3 decimals coincide. The cubic root of 213020520 is about 597.2284393544.

Adding to 213020520 its reverse (25020312), we get a palindrome (238040832).

The spelling of 213020520 in words is "two hundred thirteen million, twenty thousand, five hundred twenty".