21248020

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{797}}^1$

素因数の和:880

約数の個数: 48

約数和(自身を含む): 47190528

約数和(自身を除く): 25942508

約数列:

[1, 2, 4, 5, 10, 20, 31, 43, 62, 86, 124, 155, 172, 215, 310, 430, 620, 797, 860, 1333, 1594, 2666, 3188, 3985, 5332, 6665, 7970, 13330, 15940, 24707, 26660, 34271, 49414, 68542, 98828, 123535, 137084, 171355, 247070, 342710, 494140, 685420, 1062401, 2124802, 4249604, 5312005, 10624010, 21248020]

約数ペア:

[(1, 21248020), (2, 10624010), (4, 5312005), (5, 4249604), (10, 2124802), (20, 1062401), (31, 685420), (43, 494140), (62, 342710), (86, 247070), (124, 171355), (155, 137084), (172, 123535), (215, 98828), (310, 68542), (430, 49414), (620, 34271), (797, 26660), (860, 24707), (1333, 15940), (1594, 13330), (2666, 7970), (3188, 6665), (3985, 5332)]