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20120031210 = 2353172115671
BaseRepresentation
bin10010101111001111…
…110100111111101010
31220221012101111010010
4102233033310333222
5312201211444320
613124254032350
71311410305056
oct225717647752
956835344103
1020120031210
118595262274
123a961a86b6
131b88512b16
14d8c20cc66
157cb57aae0
hex4af3f4fea

20120031210 has 32 divisors (see below), whose sum is σ = 48440426112. Its totient is φ = 5348413760.

The previous prime is 20120031187. The next prime is 20120031223. The reversal of 20120031210 is 1213002102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1048326 + ... + 1067345.

It is an arithmetic number, because the mean of its divisors is an integer number (1513763316).

Almost surely, 220120031210 is an apocalyptic number.

20120031210 is an abundant number, since it is smaller than the sum of its proper divisors (28320394902).

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

20120031210 is a wasteful number, since it uses less digits than its factorization.

20120031210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115998.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20120031210 its reverse (1213002102), we get a palindrome (21333033312).

The spelling of 20120031210 in words is "twenty billion, one hundred twenty million, thirty-one thousand, two hundred ten".

Divisors: 1 2 3 5 6 10 15 30 317 634 951 1585 1902 3170 4755 9510 2115671 4231342 6347013 10578355 12694026 21156710 31735065 63470130 670667707 1341335414 2012003121 3353338535 4024006242 6706677070 10060015605 20120031210