20143953 has 6 divisors (see below), whose sum is σ = 29096834. Its totient is φ = 13429296.

The previous prime is 20143943. The next prime is 20143961. The reversal of 20143953 is 35934102.

It can be written as a sum of positive squares in only one way, i.e., 15000129 + 5143824 = 3873^2 + 2268^2 .

It is not a de Polignac number, because 20143953 - 2⁶ = 20143889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20143913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1119100 + ... + 1119117.

Almost surely, 2^20143953 is an apocalyptic number.

It is an amenable number.

20143953 is a deficient number, since it is larger than the sum of its proper divisors (8952881).

20143953 is a wasteful number, since it uses less digits than its factorization.

20143953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238223 (or 2238220 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20143953 is about 4488.2015329083. The cubic root of 20143953 is about 272.0914529921.

The spelling of 20143953 in words is "twenty million, one hundred forty-three thousand, nine hundred fifty-three".