20403890

素因数分解:

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

素因数の和:195

約数の個数: 64

約数和(自身を含む): 41997312

約数和(自身を除く): 21593422

約数列:

[1, 2, 5, 10, 13, 26, 31, 61, 62, 65, 83, 122, 130, 155, 166, 305, 310, 403, 415, 610, 793, 806, 830, 1079, 1586, 1891, 2015, 2158, 2573, 3782, 3965, 4030, 5063, 5146, 5395, 7930, 9455, 10126, 10790, 12865, 18910, 24583, 25315, 25730, 33449, 49166, 50630, 65819, 66898, 122915, 131638, 156953, 167245, 245830, 313906, 329095, 334490, 658190, 784765, 1569530, 2040389, 4080778, 10201945, 20403890]

約数ペア:

[(1, 20403890), (2, 10201945), (5, 4080778), (10, 2040389), (13, 1569530), (26, 784765), (31, 658190), (61, 334490), (62, 329095), (65, 313906), (83, 245830), (122, 167245), (130, 156953), (155, 131638), (166, 122915), (305, 66898), (310, 65819), (403, 50630), (415, 49166), (610, 33449), (793, 25730), (806, 25315), (830, 24583), (1079, 18910), (1586, 12865), (1891, 10790), (2015, 10126), (2158, 9455), (2573, 7930), (3782, 5395), (3965, 5146), (4030, 5063)]