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23220072 = 2332322501
BaseRepresentation
bin101100010010…
…0111101101000
31121200200221200
41120210331220
521421020242
62145404200
7401240001
oct130447550
947620850
1023220072
111211a647
127939660
134a6ccb5
1431261a8
15208a04c
hex1624f68

23220072 has 24 divisors (see below), whose sum is σ = 62887890. Its totient is φ = 7740000.

The previous prime is 23220049. The next prime is 23220073. The reversal of 23220072 is 27002232.

It can be written as a sum of positive squares in only one way, i.e., 22524516 + 695556 = 4746^2 + 834^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (23220073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161179 + ... + 161322.

Almost surely, 223220072 is an apocalyptic number.

It is an amenable number.

23220072 is an abundant number, since it is smaller than the sum of its proper divisors (39667818).

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

23220072 is a wasteful number, since it uses less digits than its factorization.

23220072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322513 (or 322506 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 23220072 is about 4818.7209921306. The cubic root of 23220072 is about 285.2908572654.

The spelling of 23220072 in words is "twenty-three million, two hundred twenty thousand, seventy-two".

Divisors: 1 2 3 4 6 8 9 12 18 24 36 72 322501 645002 967503 1290004 1935006 2580008 2902509 3870012 5805018 7740024 11610036 23220072