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216662020 = 22510833101
BaseRepresentation
bin11001110101000…
…00000000000100
3120002200120102021
430322200000010
5420431141040
633255452524
75240411461
oct1472400004
9502616367
10216662020
11101333423
1260687144
1335b6c2a3
1420abc668
151404b24a
hexcea0004

216662020 has 12 divisors (see below), whose sum is σ = 454990284. Its totient is φ = 86664800.

The previous prime is 216662009. The next prime is 216662023. The reversal of 216662020 is 20266612.

It can be written as a sum of positive squares in 2 ways, for example, as 54405376 + 162256644 = 7376^2 + 12738^2 .

It is not an unprimeable number, because it can be changed into a prime (216662023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5416531 + ... + 5416570.

It is an arithmetic number, because the mean of its divisors is an integer number (37915857).

Almost surely, 2216662020 is an apocalyptic number.

216662020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216662020 is an abundant number, since it is smaller than the sum of its proper divisors (238328264).

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

216662020 is a wasteful number, since it uses less digits than its factorization.

216662020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10833110 (or 10833108 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 216662020 is about 14719.4436036149. The cubic root of 216662020 is about 600.6123563018.

The spelling of 216662020 in words is "two hundred sixteen million, six hundred sixty-two thousand, twenty".

Divisors: 1 2 4 5 10 20 10833101 21666202 43332404 54165505 108331010 216662020