21253725

素因数分解:

$3^3\times 5^2\times {\mathrm{23}}^1\times {\mathrm{37}}^2$

素因数の和:116

約数の個数: 72

約数和(自身を含む): 41872320

約数和(自身を除く): 20618595

約数列:

[1, 3, 5, 9, 15, 23, 25, 27, 37, 45, 69, 75, 111, 115, 135, 185, 207, 225, 333, 345, 555, 575, 621, 675, 851, 925, 999, 1035, 1369, 1665, 1725, 2553, 2775, 3105, 4107, 4255, 4995, 5175, 6845, 7659, 8325, 12321, 12765, 15525, 20535, 21275, 22977, 24975, 31487, 34225, 36963, 38295, 61605, 63825, 94461, 102675, 114885, 157435, 184815, 191475, 283383, 308025, 472305, 574425, 787175, 850149, 924075, 1416915, 2361525, 4250745, 7084575, 21253725]

約数ペア:

[(1, 21253725), (3, 7084575), (5, 4250745), (9, 2361525), (15, 1416915), (23, 924075), (25, 850149), (27, 787175), (37, 574425), (45, 472305), (69, 308025), (75, 283383), (111, 191475), (115, 184815), (135, 157435), (185, 114885), (207, 102675), (225, 94461), (333, 63825), (345, 61605), (555, 38295), (575, 36963), (621, 34225), (675, 31487), (851, 24975), (925, 22977), (999, 21275), (1035, 20535), (1369, 15525), (1665, 12765), (1725, 12321), (2553, 8325), (2775, 7659), (3105, 6845), (4107, 5175), (4255, 4995)]