20699707 has 16 divisors (see below), whose sum is σ = 24984000. Its totient is φ = 17122560.

The previous prime is 20699671. The next prime is 20699713. The reversal of 20699707 is 70799602.

It is not a de Polignac number, because 20699707 - 2⁷ = 20699579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20699707.

It is not an unprimeable number, because it can be changed into a prime (20699407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8907 + ... + 10987.

It is an arithmetic number, because the mean of its divisors is an integer number (1561500).

Almost surely, 2^20699707 is an apocalyptic number.

20699707 is a deficient number, since it is larger than the sum of its proper divisors (4284293).

20699707 is an equidigital number, since it uses as much as digits as its factorization.

20699707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2117 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 20699707 is about 4549.6930665705. The cubic root of 20699707 is about 274.5710425354.

The spelling of 20699707 in words is "twenty million, six hundred ninety-nine thousand, seven hundred seven".