20616630 has 32 divisors (see below), whose sum is σ = 50112000. Its totient is φ = 5427552.

The previous prime is 20616623. The next prime is 20616647. The reversal of 20616630 is 3661602.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20616630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1980 + ... + 6719.

It is an arithmetic number, because the mean of its divisors is an integer number (1566000).

Almost surely, 2^20616630 is an apocalyptic number.

20616630 is an abundant number, since it is smaller than the sum of its proper divisors (29495370).

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

20616630 is a wasteful number, since it uses less digits than its factorization.

20616630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8788.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20616630 is about 4540.5539309648. The cubic root of 20616630 is about 274.2032253652.

It can be divided in two parts, 206 and 16630, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 20616630 in words is "twenty million, six hundred sixteen thousand, six hundred thirty".