20077421 has 32 divisors (see below), whose sum is σ = 26046720. Its totient is φ = 15054336.

The previous prime is 20077417. The next prime is 20077423. The reversal of 20077421 is 12477002.

It is a cyclic number.

It is not a de Polignac number, because 20077421 - 2² = 20077417 is a prime.

It is a super-2 number, since 2×20077421² = 806205668022482, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 8.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20077423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225545 + ... + 225633.

It is an arithmetic number, because the mean of its divisors is an integer number (813960).

Almost surely, 2^20077421 is an apocalyptic number.

It is an amenable number.

20077421 is a deficient number, since it is larger than the sum of its proper divisors (5969299).

20077421 is a wasteful number, since it uses less digits than its factorization.

20077421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20077421 is about 4480.7835252331. The cubic root of 20077421 is about 271.7915655547.

The spelling of 20077421 in words is "twenty million, seventy-seven thousand, four hundred twenty-one".