212540020 has 96 divisors (see below), whose sum is σ = 563834880. Its totient is φ = 65370240.

The previous prime is 212539997. The next prime is 212540051. The reversal of 212540020 is 20045212.

212540020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212539976 and 212540003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120787 + ... + 122533.

It is an arithmetic number, because the mean of its divisors is an integer number (5873280).

Almost surely, 2^212540020 is an apocalyptic number.

212540020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212540020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281917440).

212540020 is an abundant number, since it is smaller than the sum of its proper divisors (351294860).

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

212540020 is a wasteful number, since it uses less digits than its factorization.

212540020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853 (or 1851 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 212540020 is about 14578.7523471661. The cubic root of 212540020 is about 596.7790549435.

Adding to 212540020 its reverse (20045212), we get a palindrome (232585232).

The spelling of 212540020 in words is "two hundred twelve million, five hundred forty thousand, twenty".