20047621 has 16 divisors (see below), whose sum is σ = 22534848. Its totient is φ = 17680000.

The previous prime is 20047609. The next prime is 20047633. The reversal of 20047621 is 12674002.

It is an interprime number because it is at equal distance from previous prime (20047609) and next prime (20047633).

It is a cyclic number.

It is not a de Polignac number, because 20047621 - 2⁷ = 20047493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20047592 and 20047601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20047681) 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, 79746 + ... + 79996.

It is an arithmetic number, because the mean of its divisors is an integer number (1408428).

Almost surely, 2^20047621 is an apocalyptic number.

It is an amenable number.

20047621 is a deficient number, since it is larger than the sum of its proper divisors (2487227).

20047621 is a wasteful number, since it uses less digits than its factorization.

20047621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20047621 is about 4477.4569791345. The cubic root of 20047621 is about 271.6570296973.

The spelling of 20047621 in words is "twenty million, forty-seven thousand, six hundred twenty-one".