206637420 has 48 divisors (see below), whose sum is σ = 631185408. Its totient is φ = 50093760.

The previous prime is 206637349. The next prime is 206637443. The reversal of 206637420 is 24736602.

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

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 155884 + ... + 157203.

It is an arithmetic number, because the mean of its divisors is an integer number (13149696).

Almost surely, 2^206637420 is an apocalyptic number.

206637420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206637420 is an abundant number, since it is smaller than the sum of its proper divisors (424547988).

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

206637420 is a wasteful number, since it uses less digits than its factorization.

206637420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313110 (or 313108 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 206637420 is about 14374.8885213069. Note that the first 3 decimals coincide. The cubic root of 206637420 is about 591.2025840009.

The spelling of 206637420 in words is "two hundred six million, six hundred thirty-seven thousand, four hundred twenty".