20281029 has 4 divisors (see below), whose sum is σ = 27041376. Its totient is φ = 13520684.

The previous prime is 20281013. The next prime is 20281039. The reversal of 20281029 is 92018202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20281029 - 2⁴ = 20281013 is a prime.

It is a super-2 number, since 2×20281029² = 822640274597682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3380169 + ... + 3380174.

It is an arithmetic number, because the mean of its divisors is an integer number (6760344).

Almost surely, 2^20281029 is an apocalyptic number.

It is an amenable number.

20281029 is a deficient number, since it is larger than the sum of its proper divisors (6760347).

20281029 is an equidigital number, since it uses as much as digits as its factorization.

20281029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760346.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20281029 is about 4503.4463469658. The cubic root of 20281029 is about 272.7072362351.

The spelling of 20281029 in words is "twenty million, two hundred eighty-one thousand, twenty-nine".