21008628

素因数分解:

$2^2\times 3^2\times {\mathrm{79}}^1\times {\mathrm{83}}^1\times {\mathrm{89}}^1$

素因数の和:261

約数の個数: 72

約数和(自身を含む): 55036800

約数和(自身を除く): 34028172

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 79, 83, 89, 158, 166, 178, 237, 249, 267, 316, 332, 356, 474, 498, 534, 711, 747, 801, 948, 996, 1068, 1422, 1494, 1602, 2844, 2988, 3204, 6557, 7031, 7387, 13114, 14062, 14774, 19671, 21093, 22161, 26228, 28124, 29548, 39342, 42186, 44322, 59013, 63279, 66483, 78684, 84372, 88644, 118026, 126558, 132966, 236052, 253116, 265932, 583573, 1167146, 1750719, 2334292, 3501438, 5252157, 7002876, 10504314, 21008628]

約数ペア:

[(1, 21008628), (2, 10504314), (3, 7002876), (4, 5252157), (6, 3501438), (9, 2334292), (12, 1750719), (18, 1167146), (36, 583573), (79, 265932), (83, 253116), (89, 236052), (158, 132966), (166, 126558), (178, 118026), (237, 88644), (249, 84372), (267, 78684), (316, 66483), (332, 63279), (356, 59013), (474, 44322), (498, 42186), (534, 39342), (711, 29548), (747, 28124), (801, 26228), (948, 22161), (996, 21093), (1068, 19671), (1422, 14774), (1494, 14062), (1602, 13114), (2844, 7387), (2988, 7031), (3204, 6557)]