20412780 has 48 divisors (see below), whose sum is σ = 57353184. Its totient is φ = 5424640.

The previous prime is 20412727. The next prime is 20412797. The reversal of 20412780 is 8721402.

It is a self number, because there is not a number n which added to its sum of digits gives 20412780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30934 + ... + 31586.

It is an arithmetic number, because the mean of its divisors is an integer number (1194858).

Almost surely, 2^20412780 is an apocalyptic number.

20412780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20412780 is an abundant number, since it is smaller than the sum of its proper divisors (36940404).

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

20412780 is a wasteful number, since it uses less digits than its factorization.

20412780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186 (or 1184 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20412780 is about 4518.0504645256. The cubic root of 20412780 is about 273.2964885229.

The spelling of 20412780 in words is "twenty million, four hundred twelve thousand, seven hundred eighty".