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20312222021 = 7132931124749
BaseRepresentation
bin10010111010101100…
…111110100101000101
31221102121000210100022
4102322230332211011
5313044412101041
613155321224525
71316233016120
oct227254764505
957377023308
1020312222021
1186837a1053
123b2a632145
131bb92947b0
14da995b3b7
157dd39124b
hex4bab3e945

20312222021 has 32 divisors (see below), whose sum is σ = 25945920000. Its totient is φ = 15466510080.

The previous prime is 20312221921. The next prime is 20312222027. The reversal of 20312222021 is 12022221302.

It is not a de Polignac number, because 20312222021 - 222 = 20308027717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312222027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 808355 + ... + 833103.

It is an arithmetic number, because the mean of its divisors is an integer number (810810000).

Almost surely, 220312222021 is an apocalyptic number.

It is an amenable number.

20312222021 is a deficient number, since it is larger than the sum of its proper divisors (5633697979).

20312222021 is a wasteful number, since it uses less digits than its factorization.

20312222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25109.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20312222021 its reverse (12022221302), we get a palindrome (32334443323).

The spelling of 20312222021 in words is "twenty billion, three hundred twelve million, two hundred twenty-two thousand, twenty-one".

Divisors: 1 7 13 29 91 203 311 377 2177 2639 4043 9019 24749 28301 63133 117247 173243 321737 717721 820729 2252159 5024047 7696939 9330373 53878573 65312611 100060207 223211231 700421449 1562478617 2901746003 20312222021