20256640

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1021}}^1$

素因数の和:1071

約数の個数: 64

約数和(自身を含む): 50037120

約数和(自身を除く): 29780480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1021, 1240, 1984, 2042, 2480, 3968, 4084, 4960, 5105, 8168, 9920, 10210, 16336, 19840, 20420, 31651, 32672, 40840, 63302, 65344, 81680, 126604, 130688, 158255, 163360, 253208, 316510, 326720, 506416, 633020, 653440, 1012832, 1266040, 2025664, 2532080, 4051328, 5064160, 10128320, 20256640]

約数ペア:

[(1, 20256640), (2, 10128320), (4, 5064160), (5, 4051328), (8, 2532080), (10, 2025664), (16, 1266040), (20, 1012832), (31, 653440), (32, 633020), (40, 506416), (62, 326720), (64, 316510), (80, 253208), (124, 163360), (128, 158255), (155, 130688), (160, 126604), (248, 81680), (310, 65344), (320, 63302), (496, 40840), (620, 32672), (640, 31651), (992, 20420), (1021, 19840), (1240, 16336), (1984, 10210), (2042, 9920), (2480, 8168), (3968, 5105), (4084, 4960)]