20697699 has 16 divisors (see below), whose sum is σ = 30205440. Its totient is φ = 12502560.

The previous prime is 20697659. The next prime is 20697701. The reversal of 20697699 is 99679602.

It is a happy number.

It is not a de Polignac number, because 20697699 - 2¹⁶ = 20632163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20697629) 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, 11257 + ... + 12965.

It is an arithmetic number, because the mean of its divisors is an integer number (1887840).

Almost surely, 2^20697699 is an apocalyptic number.

20697699 is a deficient number, since it is larger than the sum of its proper divisors (9507741).

20697699 is a wasteful number, since it uses less digits than its factorization.

20697699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 20697699 is about 4549.4723869917. The cubic root of 20697699 is about 274.5621638834.

The spelling of 20697699 in words is "twenty million, six hundred ninety-seven thousand, six hundred ninety-nine".