81615560

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{83}}^1$

素因数の和:199

約数の個数: 128

約数和(自身を含む): 209986560

約数和(自身を除く): 128371000

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 61, 62, 65, 83, 104, 122, 124, 130, 155, 166, 244, 248, 260, 305, 310, 332, 403, 415, 488, 520, 610, 620, 664, 793, 806, 830, 1079, 1220, 1240, 1586, 1612, 1660, 1891, 2015, 2158, 2440, 2573, 3172, 3224, 3320, 3782, 3965, 4030, 4316, 5063, 5146, 5395, 6344, 7564, 7930, 8060, 8632, 9455, 10126, 10292, 10790, 12865, 15128, 15860, 16120, 18910, 20252, 20584, 21580, 24583, 25315, 25730, 31720, 33449, 37820, 40504, 43160, 49166, 50630, 51460, 65819, 66898, 75640, 98332, 101260, 102920, 122915, 131638, 133796, 156953, 167245, 196664, 202520, 245830, 263276, 267592, 313906, 329095, 334490, 491660, 526552, 627812, 658190, 668980, 784765, 983320, 1255624, 1316380, 1337960, 1569530, 2040389, 2632760, 3139060, 4080778, 6278120, 8161556, 10201945, 16323112, 20403890, 40807780, 81615560]

約数ペア:

[(1, 81615560), (2, 40807780), (4, 20403890), (5, 16323112), (8, 10201945), (10, 8161556), (13, 6278120), (20, 4080778), (26, 3139060), (31, 2632760), (40, 2040389), (52, 1569530), (61, 1337960), (62, 1316380), (65, 1255624), (83, 983320), (104, 784765), (122, 668980), (124, 658190), (130, 627812), (155, 526552), (166, 491660), (244, 334490), (248, 329095), (260, 313906), (305, 267592), (310, 263276), (332, 245830), (403, 202520), (415, 196664), (488, 167245), (520, 156953), (610, 133796), (620, 131638), (664, 122915), (793, 102920), (806, 101260), (830, 98332), (1079, 75640), (1220, 66898), (1240, 65819), (1586, 51460), (1612, 50630), (1660, 49166), (1891, 43160), (2015, 40504), (2158, 37820), (2440, 33449), (2573, 31720), (3172, 25730), (3224, 25315), (3320, 24583), (3782, 21580), (3965, 20584), (4030, 20252), (4316, 18910), (5063, 16120), (5146, 15860), (5395, 15128), (6344, 12865), (7564, 10790), (7930, 10292), (8060, 10126), (8632, 9455)]