20621630 has 16 divisors (see below), whose sum is σ = 37481184. Its totient is φ = 8168160.

The previous prime is 20621609. The next prime is 20621677. The reversal of 20621630 is 3612602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8981 + ... + 11040.

It is an arithmetic number, because the mean of its divisors is an integer number (2342574).

Almost surely, 2^20621630 is an apocalyptic number.

20621630 is a deficient number, since it is larger than the sum of its proper divisors (16859554).

20621630 is a wasteful number, since it uses less digits than its factorization.

20621630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20131.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20621630 is about 4541.1044912004. The cubic root of 20621630 is about 274.2253904056.

Subtracting from 20621630 its reverse (3612602), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 20621630 in words is "twenty million, six hundred twenty-one thousand, six hundred thirty".