20729460 has 48 divisors (see below), whose sum is σ = 61459776. Its totient is φ = 5202432.

The previous prime is 20729419. The next prime is 20729479. The reversal of 20729460 is 6492702.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9142 + ... + 11181.

It is an arithmetic number, because the mean of its divisors is an integer number (1280412).

Almost surely, 2^20729460 is an apocalyptic number.

20729460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20729460 is an abundant number, since it is smaller than the sum of its proper divisors (40730316).

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

20729460 is a wasteful number, since it uses less digits than its factorization.

20729460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20352 (or 20350 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20729460 is about 4552.9616734605. The cubic root of 20729460 is about 274.7025323396.

The spelling of 20729460 in words is "twenty million, seven hundred twenty-nine thousand, four hundred sixty".