20508628 has 24 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 8766048.

The previous prime is 20508611. The next prime is 20508643. The reversal of 20508628 is 82680502.

It is a self number, because there is not a number n which added to its sum of digits gives 20508628.

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, 13533 + ... + 14971.

It is an arithmetic number, because the mean of its divisors is an integer number (1713600).

Almost surely, 2^20508628 is an apocalyptic number.

20508628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20508628 is an abundant number, since it is smaller than the sum of its proper divisors (20617772).

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

20508628 is a wasteful number, since it uses less digits than its factorization.

20508628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20508628 is about 4528.6452720433. The cubic root of 20508628 is about 273.7235743832.

The spelling of 20508628 in words is "twenty million, five hundred eight thousand, six hundred twenty-eight".