21548720

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8689}}^1$

素因数の和:8733

約数の個数: 40

約数和(自身を含む): 51722880

約数和(自身を除く): 30174160

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8689, 17378, 34756, 43445, 69512, 86890, 139024, 173780, 269359, 347560, 538718, 695120, 1077436, 1346795, 2154872, 2693590, 4309744, 5387180, 10774360, 21548720]

約数ペア:

[(1, 21548720), (2, 10774360), (4, 5387180), (5, 4309744), (8, 2693590), (10, 2154872), (16, 1346795), (20, 1077436), (31, 695120), (40, 538718), (62, 347560), (80, 269359), (124, 173780), (155, 139024), (248, 86890), (310, 69512), (496, 43445), (620, 34756), (1240, 17378), (2480, 8689)]