20953429 has 6 divisors (see below), whose sum is σ = 24374454. Its totient is φ = 17960040.

The previous prime is 20953421. The next prime is 20953451. The reversal of 20953429 is 92435902.

It can be written as a sum of positive squares in only one way, i.e., 18472804 + 2480625 = 4298^2 + 1575^2 .

It is not a de Polignac number, because 20953429 - 2³ = 20953421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20953394 and 20953403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953421) 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, 213762 + ... + 213859.

It is an arithmetic number, because the mean of its divisors is an integer number (4062409).

Almost surely, 2^20953429 is an apocalyptic number.

It is an amenable number.

20953429 is a deficient number, since it is larger than the sum of its proper divisors (3421025).

20953429 is an equidigital number, since it uses as much as digits as its factorization.

20953429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427635 (or 427628 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20953429 is about 4577.4915619802. The cubic root of 20953429 is about 275.6883208848.

The spelling of 20953429 in words is "twenty million, nine hundred fifty-three thousand, four hundred twenty-nine".