20933421 has 16 divisors (see below), whose sum is σ = 29515200. Its totient is φ = 13160448.

The previous prime is 20933399. The next prime is 20933449. The reversal of 20933421 is 12433902.

It is not a de Polignac number, because 20933421 - 2⁹ = 20932909 is a prime.

It is a super-2 number, since 2×20933421² = 876416229526482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20933391 and 20933400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20933461) 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, 13935 + ... + 15363.

It is an arithmetic number, because the mean of its divisors is an integer number (1844700).

Almost surely, 2^20933421 is an apocalyptic number.

It is an amenable number.

20933421 is a deficient number, since it is larger than the sum of its proper divisors (8581779).

20933421 is a wasteful number, since it uses less digits than its factorization.

20933421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20933421 is about 4575.3055635662. The cubic root of 20933421 is about 275.6005432303.

The spelling of 20933421 in words is "twenty million, nine hundred thirty-three thousand, four hundred twenty-one".