20825980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{269}}^1$

素因数の和:371

約数の個数: 72

約数和(自身を含む): 51710400

約数和(自身を除く): 30884420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 79, 98, 140, 158, 196, 245, 269, 316, 395, 490, 538, 553, 790, 980, 1076, 1106, 1345, 1580, 1883, 2212, 2690, 2765, 3766, 3871, 5380, 5530, 7532, 7742, 9415, 11060, 13181, 15484, 18830, 19355, 21251, 26362, 37660, 38710, 42502, 52724, 65905, 77420, 85004, 106255, 131810, 148757, 212510, 263620, 297514, 425020, 595028, 743785, 1041299, 1487570, 2082598, 2975140, 4165196, 5206495, 10412990, 20825980]

約数ペア:

[(1, 20825980), (2, 10412990), (4, 5206495), (5, 4165196), (7, 2975140), (10, 2082598), (14, 1487570), (20, 1041299), (28, 743785), (35, 595028), (49, 425020), (70, 297514), (79, 263620), (98, 212510), (140, 148757), (158, 131810), (196, 106255), (245, 85004), (269, 77420), (316, 65905), (395, 52724), (490, 42502), (538, 38710), (553, 37660), (790, 26362), (980, 21251), (1076, 19355), (1106, 18830), (1345, 15484), (1580, 13181), (1883, 11060), (2212, 9415), (2690, 7742), (2765, 7532), (3766, 5530), (3871, 5380)]