20213297 has 16 divisors (see below), whose sum is σ = 23076480. Its totient is φ = 17563392.

The previous prime is 20213293. The next prime is 20213309. The reversal of 20213297 is 79231202.

It is a cyclic number.

It is not a de Polignac number, because 20213297 - 2² = 20213293 is a prime.

It is a super-2 number, since 2×20213297² = 817154751220418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213293) 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, 19529 + ... + 20537.

It is an arithmetic number, because the mean of its divisors is an integer number (1442280).

Almost surely, 2^20213297 is an apocalyptic number.

It is an amenable number.

20213297 is a deficient number, since it is larger than the sum of its proper divisors (2863183).

20213297 is a wasteful number, since it uses less digits than its factorization.

20213297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20213297 is about 4495.9200393245. The cubic root of 20213297 is about 272.4033133402.

Adding to 20213297 its reverse (79231202), we get a palindrome (99444499).

The spelling of 20213297 in words is "twenty million, two hundred thirteen thousand, two hundred ninety-seven".