20797621 has 8 divisors (see below), whose sum is σ = 23120384. Its totient is φ = 18578160.

The previous prime is 20797603. The next prime is 20797643. The reversal of 20797621 is 12679702.

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 20797621 - 2⁷ = 20797493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20797661) 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, 25401 + ... + 26206.

It is an arithmetic number, because the mean of its divisors is an integer number (2890048).

Almost surely, 2^20797621 is an apocalyptic number.

It is an amenable number.

20797621 is a deficient number, since it is larger than the sum of its proper divisors (2322763).

20797621 is a wasteful number, since it uses less digits than its factorization.

20797621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51651.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 20797621 is about 4560.4408778100. The cubic root of 20797621 is about 275.0032881150.

The spelling of 20797621 in words is "twenty million, seven hundred ninety-seven thousand, six hundred twenty-one".