21424720

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{163}}^1$

素因数の和:260

約数の個数: 80

約数和(自身を含む): 52710912

約数和(自身を除く): 31286192

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 53, 62, 80, 106, 124, 155, 163, 212, 248, 265, 310, 326, 424, 496, 530, 620, 652, 815, 848, 1060, 1240, 1304, 1630, 1643, 2120, 2480, 2608, 3260, 3286, 4240, 5053, 6520, 6572, 8215, 8639, 10106, 13040, 13144, 16430, 17278, 20212, 25265, 26288, 32860, 34556, 40424, 43195, 50530, 65720, 69112, 80848, 86390, 101060, 131440, 138224, 172780, 202120, 267809, 345560, 404240, 535618, 691120, 1071236, 1339045, 2142472, 2678090, 4284944, 5356180, 10712360, 21424720]

約数ペア:

[(1, 21424720), (2, 10712360), (4, 5356180), (5, 4284944), (8, 2678090), (10, 2142472), (16, 1339045), (20, 1071236), (31, 691120), (40, 535618), (53, 404240), (62, 345560), (80, 267809), (106, 202120), (124, 172780), (155, 138224), (163, 131440), (212, 101060), (248, 86390), (265, 80848), (310, 69112), (326, 65720), (424, 50530), (496, 43195), (530, 40424), (620, 34556), (652, 32860), (815, 26288), (848, 25265), (1060, 20212), (1240, 17278), (1304, 16430), (1630, 13144), (1643, 13040), (2120, 10106), (2480, 8639), (2608, 8215), (3260, 6572), (3286, 6520), (4240, 5053)]