20477231 has 8 divisors (see below), whose sum is σ = 22823280. Its totient is φ = 18258048.

The previous prime is 20477227. The next prime is 20477251. The reversal of 20477231 is 13277402.

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 20477231 - 2² = 20477227 is a prime.

It is a super-2 number, since 2×20477231² = 838633978854722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20477231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20477251) 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, 31376 + ... + 32021.

It is an arithmetic number, because the mean of its divisors is an integer number (2852910).

Almost surely, 2^20477231 is an apocalyptic number.

20477231 is a deficient number, since it is larger than the sum of its proper divisors (2346049).

20477231 is a wasteful number, since it uses less digits than its factorization.

20477231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63433.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20477231 is about 4525.1774550839. The cubic root of 20477231 is about 273.5838203828.

The spelling of 20477231 in words is "twenty million, four hundred seventy-seven thousand, two hundred thirty-one".