20213340 has 192 divisors, whose sum is σ = 72576000. Its totient is φ = 4091904.

The previous prime is 20213317. The next prime is 20213351. The reversal of 20213340 is 4331202.

20213340 = T₁₉ + T₂₀ + ... + T₄₉₄.

It is a super-2 number, since 2×20213340² = 817158227911200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 135586 + ... + 135734.

It is an arithmetic number, because the mean of its divisors is an integer number (378000).

Almost surely, 2^20213340 is an apocalyptic number.

20213340 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 20213340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

20213340 is an abundant number, since it is smaller than the sum of its proper divisors (52362660).

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

20213340 is a wasteful number, since it uses less digits than its factorization.

20213340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20213340 is about 4495.9248214355. The cubic root of 20213340 is about 272.4035065024.

Adding to 20213340 its reverse (4331202), we get a palindrome (24544542).

The spelling of 20213340 in words is "twenty million, two hundred thirteen thousand, three hundred forty".