21398728

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{67}}^1\times {\mathrm{83}}^1$

素因数の和:206

約数の個数: 64

約数和(自身を含む): 45581760

約数和(自身を除く): 24183032

約数列:

[1, 2, 4, 8, 13, 26, 37, 52, 67, 74, 83, 104, 134, 148, 166, 268, 296, 332, 481, 536, 664, 871, 962, 1079, 1742, 1924, 2158, 2479, 3071, 3484, 3848, 4316, 4958, 5561, 6142, 6968, 8632, 9916, 11122, 12284, 19832, 22244, 24568, 32227, 39923, 44488, 64454, 72293, 79846, 128908, 144586, 159692, 205757, 257816, 289172, 319384, 411514, 578344, 823028, 1646056, 2674841, 5349682, 10699364, 21398728]

約数ペア:

[(1, 21398728), (2, 10699364), (4, 5349682), (8, 2674841), (13, 1646056), (26, 823028), (37, 578344), (52, 411514), (67, 319384), (74, 289172), (83, 257816), (104, 205757), (134, 159692), (148, 144586), (166, 128908), (268, 79846), (296, 72293), (332, 64454), (481, 44488), (536, 39923), (664, 32227), (871, 24568), (962, 22244), (1079, 19832), (1742, 12284), (1924, 11122), (2158, 9916), (2479, 8632), (3071, 6968), (3484, 6142), (3848, 5561), (4316, 4958)]