20355480 has 48 divisors (see below), whose sum is σ = 66156480. Its totient is φ = 5428032.

The previous prime is 20355473. The next prime is 20355497. The reversal of 20355480 is 8455302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27912 + ... + 28631.

It is an arithmetic number, because the mean of its divisors is an integer number (1378260).

Almost surely, 2^20355480 is an apocalyptic number.

20355480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20355480 is an abundant number, since it is smaller than the sum of its proper divisors (45801000).

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

20355480 is a wasteful number, since it uses less digits than its factorization.

20355480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56560 (or 56553 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20355480 is about 4511.7047775758. The cubic root of 20355480 is about 273.0405285400.

The spelling of 20355480 in words is "twenty million, three hundred fifty-five thousand, four hundred eighty".