20212990

素因数分解:

$2^1\times 5^1\times 7^3\times {\mathrm{71}}^1\times {\mathrm{83}}^1$

素因数の和:182

約数の個数: 64

約数和(自身を含む): 43545600

約数和(自身を除く): 23332610

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 71, 83, 98, 142, 166, 245, 343, 355, 415, 490, 497, 581, 686, 710, 830, 994, 1162, 1715, 2485, 2905, 3430, 3479, 4067, 4970, 5810, 5893, 6958, 8134, 11786, 17395, 20335, 24353, 28469, 29465, 34790, 40670, 41251, 48706, 56938, 58930, 82502, 121765, 142345, 206255, 243530, 284690, 288757, 412510, 577514, 1443785, 2021299, 2887570, 4042598, 10106495, 20212990]

約数ペア:

[(1, 20212990), (2, 10106495), (5, 4042598), (7, 2887570), (10, 2021299), (14, 1443785), (35, 577514), (49, 412510), (70, 288757), (71, 284690), (83, 243530), (98, 206255), (142, 142345), (166, 121765), (245, 82502), (343, 58930), (355, 56938), (415, 48706), (490, 41251), (497, 40670), (581, 34790), (686, 29465), (710, 28469), (830, 24353), (994, 20335), (1162, 17395), (1715, 11786), (2485, 8134), (2905, 6958), (3430, 5893), (3479, 5810), (4067, 4970)]