20621634 has 32 divisors (see below), whose sum is σ = 46448640. Its totient is φ = 6046800.

The previous prime is 20621609. The next prime is 20621677. The reversal of 20621634 is 43612602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2994 + ... + 7085.

It is an arithmetic number, because the mean of its divisors is an integer number (1451520).

Almost surely, 2^20621634 is an apocalyptic number.

20621634 is an abundant number, since it is smaller than the sum of its proper divisors (25827006).

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

20621634 is a wasteful number, since it uses less digits than its factorization.

20621634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20621634 is about 4541.1049316218. The cubic root of 20621634 is about 274.2254081362.

The spelling of 20621634 in words is "twenty million, six hundred twenty-one thousand, six hundred thirty-four".