21140520

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{241}}^1$

素因数の和:315

約数の個数: 128

約数和(自身を含む): 68999040

約数和(自身を除く): 47858520

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 30, 34, 40, 43, 51, 60, 68, 85, 86, 102, 120, 129, 136, 170, 172, 204, 215, 241, 255, 258, 340, 344, 408, 430, 482, 510, 516, 645, 680, 723, 731, 860, 964, 1020, 1032, 1205, 1290, 1446, 1462, 1720, 1928, 2040, 2193, 2410, 2580, 2892, 2924, 3615, 3655, 4097, 4386, 4820, 5160, 5784, 5848, 7230, 7310, 8194, 8772, 9640, 10363, 10965, 12291, 14460, 14620, 16388, 17544, 20485, 20726, 21930, 24582, 28920, 29240, 31089, 32776, 40970, 41452, 43860, 49164, 51815, 61455, 62178, 81940, 82904, 87720, 98328, 103630, 122910, 124356, 155445, 163880, 176171, 207260, 245820, 248712, 310890, 352342, 414520, 491640, 528513, 621780, 704684, 880855, 1057026, 1243560, 1409368, 1761710, 2114052, 2642565, 3523420, 4228104, 5285130, 7046840, 10570260, 21140520]

約数ペア:

[(1, 21140520), (2, 10570260), (3, 7046840), (4, 5285130), (5, 4228104), (6, 3523420), (8, 2642565), (10, 2114052), (12, 1761710), (15, 1409368), (17, 1243560), (20, 1057026), (24, 880855), (30, 704684), (34, 621780), (40, 528513), (43, 491640), (51, 414520), (60, 352342), (68, 310890), (85, 248712), (86, 245820), (102, 207260), (120, 176171), (129, 163880), (136, 155445), (170, 124356), (172, 122910), (204, 103630), (215, 98328), (241, 87720), (255, 82904), (258, 81940), (340, 62178), (344, 61455), (408, 51815), (430, 49164), (482, 43860), (510, 41452), (516, 40970), (645, 32776), (680, 31089), (723, 29240), (731, 28920), (860, 24582), (964, 21930), (1020, 20726), (1032, 20485), (1205, 17544), (1290, 16388), (1446, 14620), (1462, 14460), (1720, 12291), (1928, 10965), (2040, 10363), (2193, 9640), (2410, 8772), (2580, 8194), (2892, 7310), (2924, 7230), (3615, 5848), (3655, 5784), (4097, 5160), (4386, 4820)]