20506230 has 64 divisors (see below), whose sum is σ = 55753920. Its totient is φ = 5361408.

The previous prime is 20506201. The next prime is 20506243. The reversal of 20506230 is 3260502.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 13594 + ... + 15026.

It is an arithmetic number, because the mean of its divisors is an integer number (871155).

Almost surely, 2^20506230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20506230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27876960).

20506230 is an abundant number, since it is smaller than the sum of its proper divisors (35247690).

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

20506230 is a wasteful number, since it uses less digits than its factorization.

20506230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20506230 is about 4528.3805052138. The cubic root of 20506230 is about 273.7129054635.

Adding to 20506230 its reverse (3260502), we get a palindrome (23766732).

It can be divided in two parts, 20506 and 230, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20506230 in words is "twenty million, five hundred six thousand, two hundred thirty".