20897335 has 8 divisors (see below), whose sum is σ = 26552016. Its totient is φ = 15734400.

The previous prime is 20897311. The next prime is 20897353. The reversal of 20897335 is 53379802.

20897335 = T₃₇₃₁ + T₃₇₃₂ + T₃₇₃₃.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20897335 is a prime.

It is a super-2 number, since 2×20897335² = 873397220204450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20897294 and 20897303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122841 + ... + 123010.

It is an arithmetic number, because the mean of its divisors is an integer number (3319002).

Almost surely, 2^20897335 is an apocalyptic number.

20897335 is the 3733-rd centered triangular number.

20897335 is a deficient number, since it is larger than the sum of its proper divisors (5654681).

20897335 is a wasteful number, since it uses less digits than its factorization.

20897335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245873.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20897335 is about 4571.3603008295. The cubic root of 20897335 is about 275.4420878204.

The spelling of 20897335 in words is "twenty million, eight hundred ninety-seven thousand, three hundred thirty-five".