20143455 has 8 divisors (see below), whose sum is σ = 32229552. Its totient is φ = 10743168.

The previous prime is 20143451. The next prime is 20143489. The reversal of 20143455 is 55434102.

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

It is not a de Polignac number, because 20143455 - 2² = 20143451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143451) 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, 671434 + ... + 671463.

It is an arithmetic number, because the mean of its divisors is an integer number (4028694).

Almost surely, 2^20143455 is an apocalyptic number.

20143455 is a deficient number, since it is larger than the sum of its proper divisors (12086097).

20143455 is a wasteful number, since it uses less digits than its factorization.

20143455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342905.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20143455 is about 4488.1460537732. The cubic root of 20143455 is about 272.0892107533.

Adding to 20143455 its reverse (55434102), we get a palindrome (75577557).

The spelling of 20143455 in words is "twenty million, one hundred forty-three thousand, four hundred fifty-five".