20429418 has 16 divisors (see below), whose sum is σ = 40903200. Its totient is φ = 6802416.

The previous prime is 20429417. The next prime is 20429471. The reversal of 20429418 is 81492402.

It is a super-2 number, since 2×20429418² = 834722239637448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20429417) 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, 9508 + ... + 11456.

It is an arithmetic number, because the mean of its divisors is an integer number (2556450).

Almost surely, 2^20429418 is an apocalyptic number.

20429418 is an abundant number, since it is smaller than the sum of its proper divisors (20473782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20429418 is a wasteful number, since it uses less digits than its factorization.

20429418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20429418 is about 4519.8913703761. The cubic root of 20429418 is about 273.3707209747.

The spelling of 20429418 in words is "twenty million, four hundred twenty-nine thousand, four hundred eighteen".