20077220 has 24 divisors (see below), whose sum is σ = 42794304. Its totient is φ = 7910496.

The previous prime is 20077217. The next prime is 20077247. The reversal of 20077220 is 2277002.

It is a Harshad number since it is a multiple of its sum of digits (20).

20077220 is a modest number, since divided by 77220 gives 20 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20077192 and 20077201.

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 7 ways as a sum of consecutive naturals, for example, 6152 + ... + 8831.

It is an arithmetic number, because the mean of its divisors is an integer number (1783096).

Almost surely, 2^20077220 is an apocalyptic number.

20077220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20077220 is an abundant number, since it is smaller than the sum of its proper divisors (22717084).

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

20077220 is a wasteful number, since it uses less digits than its factorization.

20077220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15059 (or 15057 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 20.

The square root of 20077220 is about 4480.7610960639. The cubic root of 20077220 is about 271.7906585610.

The spelling of 20077220 in words is "twenty million, seventy-seven thousand, two hundred twenty".