20970688 has 14 divisors (see below), whose sum is σ = 41613836. Its totient is φ = 10485312.

The previous prime is 20970679. The next prime is 20970689. The reversal of 20970688 is 88607902.

It is a self number, because there is not a number n which added to its sum of digits gives 20970688.

It is not an unprimeable number, because it can be changed into a prime (20970689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163770 + ... + 163897.

Almost surely, 2^20970688 is an apocalyptic number.

It is an amenable number.

20970688 is a deficient number, since it is larger than the sum of its proper divisors (20643148).

20970688 is an equidigital number, since it uses as much as digits as its factorization.

20970688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327679 (or 327669 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 20970688 is about 4579.3763767570. The cubic root of 20970688 is about 275.7639934463.

The spelling of 20970688 in words is "twenty million, nine hundred seventy thousand, six hundred eighty-eight".