21198380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{97}}^1\times {\mathrm{223}}^1$

素因数の和:343

約数の個数: 72

約数和(自身を含む): 52553088

約数和(自身を除く): 31354708

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 97, 98, 140, 194, 196, 223, 245, 388, 446, 485, 490, 679, 892, 970, 980, 1115, 1358, 1561, 1940, 2230, 2716, 3122, 3395, 4460, 4753, 6244, 6790, 7805, 9506, 10927, 13580, 15610, 19012, 21631, 21854, 23765, 31220, 43262, 43708, 47530, 54635, 86524, 95060, 108155, 109270, 151417, 216310, 218540, 302834, 432620, 605668, 757085, 1059919, 1514170, 2119838, 3028340, 4239676, 5299595, 10599190, 21198380]

約数ペア:

[(1, 21198380), (2, 10599190), (4, 5299595), (5, 4239676), (7, 3028340), (10, 2119838), (14, 1514170), (20, 1059919), (28, 757085), (35, 605668), (49, 432620), (70, 302834), (97, 218540), (98, 216310), (140, 151417), (194, 109270), (196, 108155), (223, 95060), (245, 86524), (388, 54635), (446, 47530), (485, 43708), (490, 43262), (679, 31220), (892, 23765), (970, 21854), (980, 21631), (1115, 19012), (1358, 15610), (1561, 13580), (1940, 10927), (2230, 9506), (2716, 7805), (3122, 6790), (3395, 6244), (4460, 4753)]