20721700

素因数分解:

$2^2\times 5^2\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:197

約数の個数: 72

約数和(自身を含む): 47358080

約数和(自身を除く): 26636380

約数列:

[1, 2, 4, 5, 10, 20, 25, 43, 50, 61, 79, 86, 100, 122, 158, 172, 215, 244, 305, 316, 395, 430, 610, 790, 860, 1075, 1220, 1525, 1580, 1975, 2150, 2623, 3050, 3397, 3950, 4300, 4819, 5246, 6100, 6794, 7900, 9638, 10492, 13115, 13588, 16985, 19276, 24095, 26230, 33970, 48190, 52460, 65575, 67940, 84925, 96380, 120475, 131150, 169850, 207217, 240950, 262300, 339700, 414434, 481900, 828868, 1036085, 2072170, 4144340, 5180425, 10360850, 20721700]

約数ペア:

[(1, 20721700), (2, 10360850), (4, 5180425), (5, 4144340), (10, 2072170), (20, 1036085), (25, 828868), (43, 481900), (50, 414434), (61, 339700), (79, 262300), (86, 240950), (100, 207217), (122, 169850), (158, 131150), (172, 120475), (215, 96380), (244, 84925), (305, 67940), (316, 65575), (395, 52460), (430, 48190), (610, 33970), (790, 26230), (860, 24095), (1075, 19276), (1220, 16985), (1525, 13588), (1580, 13115), (1975, 10492), (2150, 9638), (2623, 7900), (3050, 6794), (3397, 6100), (3950, 5246), (4300, 4819)]