20651146 has 16 divisors (see below), whose sum is σ = 32094720. Its totient is φ = 9955440.

The previous prime is 20651117. The next prime is 20651149. The reversal of 20651146 is 64115602.

20651146 = T₁₀₃ + T₁₀₄ + ... + T₄₉₉.

It is a super-2 number, since 2×20651146² = 852939662226632, 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 20651146.

It is not an unprimeable number, because it can be changed into a prime (20651149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24195 + ... + 25033.

It is an arithmetic number, because the mean of its divisors is an integer number (2005920).

Almost surely, 2^20651146 is an apocalyptic number.

20651146 is a deficient number, since it is larger than the sum of its proper divisors (11443574).

20651146 is a wasteful number, since it uses less digits than its factorization.

20651146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20651146 is about 4544.3531993013. The cubic root of 20651146 is about 274.3561621243.

Adding to 20651146 its reverse (64115602), we get a palindrome (84766748).

The spelling of 20651146 in words is "twenty million, six hundred fifty-one thousand, one hundred forty-six".