20610421 has 8 divisors (see below), whose sum is σ = 23364320. Its totient is φ = 18023472.

The previous prime is 20610407. The next prime is 20610427. The reversal of 20610421 is 12401602.

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

It is a cyclic number.

It is not a de Polignac number, because 20610421 - 2¹¹ = 20608373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20610395 and 20610404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20610427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41475 + ... + 41968.

It is an arithmetic number, because the mean of its divisors is an integer number (2920540).

Almost surely, 2^20610421 is an apocalyptic number.

It is an amenable number.

20610421 is a deficient number, since it is larger than the sum of its proper divisors (2753899).

20610421 is a wasteful number, since it uses less digits than its factorization.

20610421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83475.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20610421 is about 4539.8701523281. The cubic root of 20610421 is about 274.1756958293.

The spelling of 20610421 in words is "twenty million, six hundred ten thousand, four hundred twenty-one".