21580275

素因数分解:

$3^1\times 5^2\times {\mathrm{53}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:216

約数の個数: 48

約数和(自身を含む): 37363680

約数和(自身を除く): 15783405

約数列:

[1, 3, 5, 15, 25, 53, 61, 75, 89, 159, 183, 265, 267, 305, 445, 795, 915, 1325, 1335, 1525, 2225, 3233, 3975, 4575, 4717, 5429, 6675, 9699, 14151, 16165, 16287, 23585, 27145, 48495, 70755, 80825, 81435, 117925, 135725, 242475, 287737, 353775, 407175, 863211, 1438685, 4316055, 7193425, 21580275]

約数ペア:

[(1, 21580275), (3, 7193425), (5, 4316055), (15, 1438685), (25, 863211), (53, 407175), (61, 353775), (75, 287737), (89, 242475), (159, 135725), (183, 117925), (265, 81435), (267, 80825), (305, 70755), (445, 48495), (795, 27145), (915, 23585), (1325, 16287), (1335, 16165), (1525, 14151), (2225, 9699), (3233, 6675), (3975, 5429), (4575, 4717)]