20155429 has 12 divisors (see below), whose sum is σ = 24084256. Its totient is φ = 16521912.

The previous prime is 20155427. The next prime is 20155441. The reversal of 20155429 is 92455102.

20155429 = T₄₇₀ + T₄₇₁ + ... + T₆₀₇.

It is not a de Polignac number, because 20155429 - 2¹ = 20155427 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20155397 and 20155406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 982 + ... + 6424.

Almost surely, 2^20155429 is an apocalyptic number.

It is an amenable number.

20155429 is a deficient number, since it is larger than the sum of its proper divisors (3928827).

20155429 is an equidigital number, since it uses as much as digits as its factorization.

20155429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496 (or 5473 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 20155429 is about 4489.4798139651. The cubic root of 20155429 is about 272.1431133048.

The spelling of 20155429 in words is "twenty million, one hundred fifty-five thousand, four hundred twenty-nine".