213706520 has 32 divisors (see below), whose sum is σ = 485805600. Its totient is φ = 84599808.

The previous prime is 213706513. The next prime is 213706567. The reversal of 213706520 is 25607312.

It is a self number, because there is not a number n which added to its sum of digits gives 213706520.

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, 23660 + ... + 31419.

It is an arithmetic number, because the mean of its divisors is an integer number (15181425).

Almost surely, 2^213706520 is an apocalyptic number.

213706520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213706520 is an abundant number, since it is smaller than the sum of its proper divisors (272099080).

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

213706520 is a wasteful number, since it uses less digits than its factorization.

213706520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55187 (or 55183 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 213706520 is about 14618.7044569620. The cubic root of 213706520 is about 597.8688466789.

The spelling of 213706520 in words is "two hundred thirteen million, seven hundred six thousand, five hundred twenty".