20213697 has 32 divisors (see below), whose sum is σ = 33433344. Its totient is φ = 10598400.

The previous prime is 20213689. The next prime is 20213717. The reversal of 20213697 is 79631202.

It is not a de Polignac number, because 20213697 - 2³ = 20213689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20213657) 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 31 ways as a sum of consecutive naturals, for example, 13947 + ... + 15327.

It is an arithmetic number, because the mean of its divisors is an integer number (1044792).

Almost surely, 2^20213697 is an apocalyptic number.

It is an amenable number.

20213697 is a deficient number, since it is larger than the sum of its proper divisors (13219647).

20213697 is a wasteful number, since it uses less digits than its factorization.

20213697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20213697 is about 4495.9645238814. The cubic root of 20213697 is about 272.4051101872.

Adding to 20213697 its reverse (79631202), we get a palindrome (99844899).

It can be divided in two parts, 20213 and 697, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20213697 in words is "twenty million, two hundred thirteen thousand, six hundred ninety-seven".