20429631 has 32 divisors (see below), whose sum is σ = 32762880. Its totient is φ = 12532608.

The previous prime is 20429627. The next prime is 20429657. The reversal of 20429631 is 13692402.

20429631 is a `hidden beast` number, since 2 + 0 + 4 + 29 + 631 = 666.

It is not a de Polignac number, because 20429631 - 2² = 20429627 is a prime.

It is a super-2 number, since 2×20429631² = 834739645592322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20429595 and 20429604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20429621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21100 + ... + 22046.

It is an arithmetic number, because the mean of its divisors is an integer number (1023840).

Almost surely, 2^20429631 is an apocalyptic number.

20429631 is a deficient number, since it is larger than the sum of its proper divisors (12333249).

20429631 is a wasteful number, since it uses less digits than its factorization.

20429631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20429631 is about 4519.9149328278. The cubic root of 20429631 is about 273.3716710387.

The spelling of 20429631 in words is "twenty million, four hundred twenty-nine thousand, six hundred thirty-one".