20505630 has 32 divisors (see below), whose sum is σ = 50264064. Its totient is φ = 5351456.

The previous prime is 20505623. The next prime is 20505643. The reversal of 20505630 is 3650502.

It is a junction number, because it is equal to n+sod(n) for n = 20505597 and 20505606.

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, 5862 + ... + 8681.

It is an arithmetic number, because the mean of its divisors is an integer number (1570752).

Almost surely, 2^20505630 is an apocalyptic number.

20505630 is an abundant number, since it is smaller than the sum of its proper divisors (29758434).

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

20505630 is a wasteful number, since it uses less digits than its factorization.

20505630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14600.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20505630 is about 4528.3142558793. The cubic root of 20505630 is about 273.7102358789.

The spelling of 20505630 in words is "twenty million, five hundred five thousand, six hundred thirty".