20506246 has 8 divisors (see below), whose sum is σ = 30905784. Its totient is φ = 10204320.

The previous prime is 20506243. The next prime is 20506247. The reversal of 20506246 is 64260502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20506246² = 841012250025032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20506246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23875 + ... + 24718.

It is an arithmetic number, because the mean of its divisors is an integer number (3863223).

Almost surely, 2^20506246 is an apocalyptic number.

20506246 is a deficient number, since it is larger than the sum of its proper divisors (10399538).

20506246 is a wasteful number, since it uses less digits than its factorization.

20506246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48806.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20506246 is about 4528.3822718494. The cubic root of 20506246 is about 273.7129766517.

Adding to 20506246 its reverse (64260502), we get a palindrome (84766748).

The spelling of 20506246 in words is "twenty million, five hundred six thousand, two hundred forty-six".