19968650

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{991}}^1$

素因数の和:1047

約数の個数: 48

約数和(自身を含む): 41330688

約数和(自身を除く): 21362038

約数列:

[1, 2, 5, 10, 13, 25, 26, 31, 50, 62, 65, 130, 155, 310, 325, 403, 650, 775, 806, 991, 1550, 1982, 2015, 4030, 4955, 9910, 10075, 12883, 20150, 24775, 25766, 30721, 49550, 61442, 64415, 128830, 153605, 307210, 322075, 399373, 644150, 768025, 798746, 1536050, 1996865, 3993730, 9984325, 19968650]

約数ペア:

[(1, 19968650), (2, 9984325), (5, 3993730), (10, 1996865), (13, 1536050), (25, 798746), (26, 768025), (31, 644150), (50, 399373), (62, 322075), (65, 307210), (130, 153605), (155, 128830), (310, 64415), (325, 61442), (403, 49550), (650, 30721), (775, 25766), (806, 24775), (991, 20150), (1550, 12883), (1982, 10075), (2015, 9910), (4030, 4955)]