20870920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{569}}^1$

素因数の和:718

約数の個数: 64

約数和(自身を含む): 54172800

約数和(自身を除く): 33301880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 131, 140, 262, 280, 524, 569, 655, 917, 1048, 1138, 1310, 1834, 2276, 2620, 2845, 3668, 3983, 4552, 4585, 5240, 5690, 7336, 7966, 9170, 11380, 15932, 18340, 19915, 22760, 31864, 36680, 39830, 74539, 79660, 149078, 159320, 298156, 372695, 521773, 596312, 745390, 1043546, 1490780, 2087092, 2608865, 2981560, 4174184, 5217730, 10435460, 20870920]

約数ペア:

[(1, 20870920), (2, 10435460), (4, 5217730), (5, 4174184), (7, 2981560), (8, 2608865), (10, 2087092), (14, 1490780), (20, 1043546), (28, 745390), (35, 596312), (40, 521773), (56, 372695), (70, 298156), (131, 159320), (140, 149078), (262, 79660), (280, 74539), (524, 39830), (569, 36680), (655, 31864), (917, 22760), (1048, 19915), (1138, 18340), (1310, 15932), (1834, 11380), (2276, 9170), (2620, 7966), (2845, 7336), (3668, 5690), (3983, 5240), (4552, 4585)]