20220621 has 8 divisors (see below), whose sum is σ = 27588000. Its totient is φ = 13166832.

The previous prime is 20220619. The next prime is 20220631. The reversal of 20220621 is 12602202.

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

It is not a de Polignac number, because 20220621 - 2¹ = 20220619 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20220621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220601) 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, 78246 + ... + 78503.

It is an arithmetic number, because the mean of its divisors is an integer number (3448500).

Almost surely, 2^20220621 is an apocalyptic number.

It is an amenable number.

20220621 is a deficient number, since it is larger than the sum of its proper divisors (7367379).

20220621 is a wasteful number, since it uses less digits than its factorization.

20220621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156795.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20220621 is about 4496.7344818212. The cubic root of 20220621 is about 272.4362098531.

Adding to 20220621 its reverse (12602202), we get a palindrome (32822823).

The spelling of 20220621 in words is "twenty million, two hundred twenty thousand, six hundred twenty-one".