209812852620 has 144 divisors (see below), whose sum is σ = 758975293440. Its totient is φ = 45872120448.

The previous prime is 209812852583. The next prime is 209812852631. The reversal of 209812852620 is 26258218902.

209812852620 is a `hidden beast` number, since 2 + 0 + 9 + 8 + 12 + 8 + 5 + 2 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3590980 + ... + 3648939.

It is an arithmetic number, because the mean of its divisors is an integer number (5270661760).

Almost surely, 2^209812852620 is an apocalyptic number.

209812852620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209812852620 is an abundant number, since it is smaller than the sum of its proper divisors (549162440820).

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

209812852620 is a wasteful number, since it uses less digits than its factorization.

209812852620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239964 (or 7239959 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 209812852620 in words is "two hundred nine billion, eight hundred twelve million, eight hundred fifty-two thousand, six hundred twenty".