20997375

素因数分解:

$3^1\times 5^3\times 7^1\times {\mathrm{19}}^1\times {\mathrm{421}}^1$

素因数の和:465

約数の個数: 64

約数和(自身を含む): 42132480

約数和(自身を除く): 21135105

約数列:

[1, 3, 5, 7, 15, 19, 21, 25, 35, 57, 75, 95, 105, 125, 133, 175, 285, 375, 399, 421, 475, 525, 665, 875, 1263, 1425, 1995, 2105, 2375, 2625, 2947, 3325, 6315, 7125, 7999, 8841, 9975, 10525, 14735, 16625, 23997, 31575, 39995, 44205, 49875, 52625, 55993, 73675, 119985, 157875, 167979, 199975, 221025, 279965, 368375, 599925, 839895, 999875, 1105125, 1399825, 2999625, 4199475, 6999125, 20997375]

約数ペア:

[(1, 20997375), (3, 6999125), (5, 4199475), (7, 2999625), (15, 1399825), (19, 1105125), (21, 999875), (25, 839895), (35, 599925), (57, 368375), (75, 279965), (95, 221025), (105, 199975), (125, 167979), (133, 157875), (175, 119985), (285, 73675), (375, 55993), (399, 52625), (421, 49875), (475, 44205), (525, 39995), (665, 31575), (875, 23997), (1263, 16625), (1425, 14735), (1995, 10525), (2105, 9975), (2375, 8841), (2625, 7999), (2947, 7125), (3325, 6315)]