20656250 has 28 divisors (see below), whose sum is σ = 38788566. Its totient is φ = 8250000.

The previous prime is 20656219. The next prime is 20656253. The reversal of 20656250 is 5265602.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 7789681 + 12866569 = 2791^2 + 3587^2 .

It is not an unprimeable number, because it can be changed into a prime (20656253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 30920 + ... + 31580.

Almost surely, 2^20656250 is an apocalyptic number.

20656250 is a deficient number, since it is larger than the sum of its proper divisors (18132316).

20656250 is an frugal number, since it uses more digits than its factorization.

20656250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20656250 is about 4544.9147406745. The cubic root of 20656250 is about 274.3787629443.

The spelling of 20656250 in words is "twenty million, six hundred fifty-six thousand, two hundred fifty".