20423029 has 4 divisors (see below), whose sum is σ = 22279680. Its totient is φ = 18566380.

The previous prime is 20423023. The next prime is 20423041. The reversal of 20423029 is 92032402.

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 20423029 - 2⁹ = 20422517 is a prime.

It is a super-2 number, since 2×20423029² = 834200227069682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423023) 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, 928309 + ... + 928330.

It is an arithmetic number, because the mean of its divisors is an integer number (5569920).

Almost surely, 2^20423029 is an apocalyptic number.

It is an amenable number.

20423029 is a deficient number, since it is larger than the sum of its proper divisors (1856651).

20423029 is a wasteful number, since it uses less digits than its factorization.

20423029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856650.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20423029 is about 4519.1845503365. The cubic root of 20423029 is about 273.3422204461.

The spelling of 20423029 in words is "twenty million, four hundred twenty-three thousand, twenty-nine".