20197120

素因数分解:

$2^8\times 5^1\times {\mathrm{31}}^1\times {\mathrm{509}}^1$

素因数の和:561

約数の個数: 72

約数和(自身を含む): 50037120

約数和(自身を除く): 29840000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 310, 320, 496, 509, 620, 640, 992, 1018, 1240, 1280, 1984, 2036, 2480, 2545, 3968, 4072, 4960, 5090, 7936, 8144, 9920, 10180, 15779, 16288, 19840, 20360, 31558, 32576, 39680, 40720, 63116, 65152, 78895, 81440, 126232, 130304, 157790, 162880, 252464, 315580, 325760, 504928, 631160, 651520, 1009856, 1262320, 2019712, 2524640, 4039424, 5049280, 10098560, 20197120]

約数ペア:

[(1, 20197120), (2, 10098560), (4, 5049280), (5, 4039424), (8, 2524640), (10, 2019712), (16, 1262320), (20, 1009856), (31, 651520), (32, 631160), (40, 504928), (62, 325760), (64, 315580), (80, 252464), (124, 162880), (128, 157790), (155, 130304), (160, 126232), (248, 81440), (256, 78895), (310, 65152), (320, 63116), (496, 40720), (509, 39680), (620, 32576), (640, 31558), (992, 20360), (1018, 19840), (1240, 16288), (1280, 15779), (1984, 10180), (2036, 9920), (2480, 8144), (2545, 7936), (3968, 5090), (4072, 4960)]